A new study suggests the failure of any one of 25 aging locks on the upper Mississippi River could result in nearly half a million truckloads of freight on highways between the Twin Cities and St. Louis.
University of Wisconsin-Madison researchers estimate that a shutdown of the river at Hannibal, Mo., would require more than 12 million tons of grain during a nine-month shipping season to be moved by truck, costing hundreds of millions of dollars and damaging already stressed roads.
The vast majority of these shipments would travel through southern Minnesota and Iowa, while a smaller amount would move through Wisconsin and Illinois, according to the study, causing nearly $29 million in pavement damage.

A map produced by the Center for Freight & Infrastructure Research & Education shows projected increases in agricultural freight hauled by trucks in the event of a Mississippi River shutdown. Rural Minnesota and Iowa roads would see the largest increase on a percentage basis with nearly 600 trucks per day hauling grain from ports in the Twin Cities and Red Wing.
The study was funded by the 10 states of the Mid-America Freight Coalition, an organization dedicated to planning, operating and improving transportation infrastructure in the Midwest.
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“We’re talking about a system,” said Ernest Perry, manager of the coalition and the lead researcher on the study. “If we don’t take care of this one part of the system it’s going to negatively impact another part of the system.”
The U.S. Army Corps of Engineers has estimated the backlogged maintenance costs for locks and dams of the Mississippi and Illinois rivers is more than $1 billion. Mostly built in the 1930s, many of the locks have reached the end of their service lives, and the inland waterway system has earned a D-minus from the American Society of Civil Engineers.
The lock and dams between Winona and La Crosse are more than 80 years old.
Bryan Peterson, navigation business line manager for the St. Paul District, said the Corps has been working in recent years to address maintenance issues as the budget allows.
“We definitely have needs,” he said. “I think we’re maintaining them well enough until we can fill those needs.”
Peterson said over the past five years the river has been open about 99 percent of the time, with most closures resulting from vessels hitting the gates rather than mechanical failure.
“It’s always a potential,” he said. “It’s a pretty good record, but there’s always that risk.”
In the event of a river closure, the study estimates, about 1.4 million tons would originate from Winona and nearly 500,000 from La Crosse, which would result in more than 190 trucks per day traveling through Wisconsin on Interstate 90.
Nearly 5.8 million tons coming from the Twin Cities and Red Wing would result in nearly 600 more trucks per day on Hwy. 52 through southern Minnesota and into Iowa.
Researchers have previously assumed railroads would absorb most of the displaced shipments during a river shutdown, the study looked at scenarios in which trucking picks up 75 to 100 percent of the load. While it’s likely that more volume would move by rail, Perry said, states were interested in seeing the impact on roads.
One 15-barge tow carries the equivalent of about two trains or more than 1,000 trucks.
The study also focused only on agricultural products, though such products made up less than 30 percent of the total river volume in 2016, according to Corps data.
"There’s stuff moving north as well," Perry noted.
Perry estimates the total costs of a season-long shutdown would be about $319.6 million, including the social costs of additional carbon dioxide emissions. The costs with failures in following years, he said, could begin to approach the $1 billion in deferred maintenance on the river.
“Everybody knows it’s an issue,” Perry said. “If we don’t take care of this one part of the system it’s going to negatively impact another part of the system.”
Photos: 400 miles of the Mississippi
94 photos: 400 miles of the Mississippi
THE GREAT RIVER-0400

A tow from the Ingram Barge Co. moves barges down the Mississippi River past the beach at Finley's Landing Park located at the end of Finley's Landing Road near Sherrill, Iowa was created from sand dredged from the river over the years and has become a popular destination on the weekend for residents in the area.
THE GREAT RIVER-0401

Sitting on one of the largest, scenic beaches on the Mississippi River Logan Kubovec of Cedar Rapids enjoys a lazy afternoon Tuesday June 13, 2017. Located at the end of Finley's Landing Road near Sherrill, Iowa in Finley's Landing Park the beach was created from sand dredged from the river over the years and has become a popular destination on the weekend for residents in the area.
THE GREAT RIVER-0402

When the John Deere plant decommissioned its power station, the cooling water channel from the Mississippi River was restored to marshland and the surrounding area is now Deer Dike Park off Riverside Road adjacent to John Deere Dubuque Works.
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Looking down from Eagle Point Park as the motorized vessel Philip M Pfeffer passes through Lock and Dam #11 on the Mississippi River at Dubuque, Iowa June 13, 2017.
THE GREAT RIVER-0404

Shawn Frares looks down from the scenic overlook in Eagle Point Park as the motorized vessel Philip M Pfeffer approaches Lock and Dam #11 on the Mississippi River at Dubuque, Iowa June 13, 2017. Frares who was in the park for a dinner event at the pavilion said, "It's sure is a beautiful view from up here."
THE GREAT RIVER-0405

A turkey vulture glides over Lock and Dam #11 on the Mississippi River at Dubuque, Iowa June 13, 2017.
THE GREAT RIVER-0406

The motorized vessel Philip M Pfeffer moves down river after passing through Lock and Dam #11 on the Mississippi River at Dubuque, Iowa June 13, 2017.
THE GREAT RIVER-0407

The General Zebulon Pike Lock and Dam No. 11 is a lock and dam located between Dubuque, Iowa and rural Grant County, Wisconsin, on the Upper Mississippi River that opened to navigation September 14, 1937. The movable portion of the dam is 1,478 feet long and consists of 13 tainter gates and three roller gates. The non-movable part is a 3,340 feet long non-overflow earthen dam that connects to the Wisconsin shore. The main lock is 110 feet wide by 600 feet long. There is also an incomplete auxiliary lock.
THE GREAT RIVER-0408

A crew member on the motorized vessel Philip M Pfeffer walks between barges as it passes through Lock and Dam #11 on the Mississippi River at Dubuque, Iowa June 13, 2017.
THE GREAT RIVER-0409

A turkey vulture glides over Lock and Dam #11 on the Mississippi River at Dubuque, Iowa June 13, 2017.
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The National Mississippi River Museum and Aquarium, the Grand Harbor Resort and Waterpark, the Diamond Jo Casino and Stone Cliff Winery are a few of the many attractions along the scenic Mississippi Riverwalk.
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The Mississippi Riverwalk is a part of an entire trail system throughout Dubuque connecting to the Heritage Trail and the nationally-renowned Field of Dreams in Dyersville, Iowa.
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River traffic passes under the Julien Dubuque Bridge as vehicles travel between Dubuque, Iowa and East Dubuque, Illinois June 14, 2017.
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While fishing with his grandfather 14-year-old Dawson Hamm of Benton, Wisconsin casts his line out into the Mississippi River just above the Dubuque Rail Bridge June 14, 2017.
THE GREAT RIVER-0414

Paul Demkier of Dubuque puts his rig together while fishing with his grandson just above the Dubuque Rail Bridge June 14, 2017. He said. "I remember coming across that bridge many times." Having learned something similar to Morse Code when he was 17, Demkier got a job with the Illinois Central Railroad as a telegrapher and depot manager.
THE GREAT RIVER-0415

The Dubuque Star Brewery is a five-story brick brew house located in the Port of Dubuque. It is designed in Romanesque style. Iowa's oldest brewery was founded by the Rhomberg family in 1898. Forced to close with the beginning of Prohibition and it reopened in 1933 with its repeal. Bottled beer was first produced by the brewery in 1935. Cans were first used in 1975. Dozens of labels were created including "Iowa Lager," "Holiday," "Dubuque Star," and "Dubuque Star Select."
THE GREAT RIVER-0416

The River Room in the Grand River Center extends over the Mississippi Riverwalk. The modern glass design is a distinct feature on the riverfront.
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The Star Brewery Complex features an historical display on the building’s past on its ground floor. Stone Cliff Winery also operates on the ground floor with an expanded winery and tasting center. Upper floors are leased office space.
THE GREAT RIVER-0418

The Star Brewery Complex features an historical display on the building’s past on its ground floor. Stone Cliff Winery also operates on the ground floor with an expanded winery and tasting center. Upper floors are leased office space.
THE GREAT RIVER-0419

The Star Brewery Complex features an historical display on the building’s past on its ground floor. Stone Cliff Winery also operates on the ground floor with an expanded winery and tasting center. Upper floors are leased office space.
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Looking through one of the open flood gates from the Mississippi Riverwalk to the Ice Harbor of Dubuque.
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Construction on the Julien Dubuque Bridge started in 1942 and finished in 1943. It was painted gray to help camouflage the bridge in case of an enemy attack. Because the bridge was financed with bonds, it initially operated as a toll bridge. Proceeds were used to help pay off the bonds. In the post-war years, traffic was so heavy the bonds were paid off 11 years early, and the bridge became toll-free in 1954. In the early 1990s, the bridge underwent an extensive renovation. The deck was replaced, and a new walkway was installed. For many years, the bridge was a dark green color; however in more recent times it again has been painted a light gray color.
THE GREAT RIVER-0422

Looking out to the Mississippi River and the Julien Dubuque Bridge from the Mississippi Riverwalk in Dubuque.
THE GREAT RIVER-0423

One of the paddle wheels from the dredge William M. Black which measures 25 feet in diameter and weighing 32 tons outside the National Mississippi River Museum & Aquarium in Dubuque, Iowa. The Center is home to museum exhibits on the culture and history of America's rivers. The campus also includes over a dozen aquariums featuring wildlife representative of that found in the Mississippi River and the Gulf of Mexico and other river systems and deltas, including giant catfish, sturgeon, ducks, frogs, turtles, rays, octopus, river otters, and more. There are also outdoor exhibits, featuring river otters, a marsh, and large artifacts, such as boats, a blacksmith shop, a stream, and raptor aviaries including bald eagle.
THE GREAT RIVER-0424

The National Mississippi River Museum & Aquarium is a museum located in Dubuque, Iowa, USA. The museum is a property of the Dubuque County Historical Society, with two centers on the riverfront campus: the Mississippi River Center and the National River Center.
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Life-size displays depicting early explorers in their environment and artifacts in the Robert J. Kehl River Galleries Diamond Jo River Center in Dubuque, Iowa
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Sacagawea - Explorer
THE GREAT RIVER-0427

John James Audubon - Naturalist
THE GREAT RIVER-0428

John Fitch - Inventor
THE GREAT RIVER-0429

Rene-Robert Cavelier LaSalle - Explorer
THE GREAT RIVER-0430

Jacques Marquette - Explorer
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Black Hawk - Native American Leader
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A grandparent points out the variety of sea life in the salt water aquarium at the Rivers to the Sea Gallery in the Robert J. Kehl River Galleries Diamond Jo River Center in Dubuque, Iowa
THE GREAT RIVER-0433

Looking down into the National Rivers Hall of Fame display in the Robert J. Kehl River Galleries Diamond Jo River Center in Dubuque, Iowa
THE GREAT RIVER-0434

Looking into the "Main Channel" aquarium at the Mississippi River Discovery Center in Dubuque, Iowa.
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Visitors attempt to identify one of the species of fish in the "Main Channel" aquarium at the Mississippi River Discovery Center in Dubuque, Iowa.
THE GREAT RIVER-0436

Looking out to the main channel of the Mississippi River from the Ice Harbor of Dubuque. When the former Diamond Jo Casino boat moved to a land based facility it opened up a water front location for the construction of a marina.
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A Great Blue Heron keeps a weary eye on visitors as they walk through the Wetland Interpretive Area at the William Woodward Mississippi River Center in Dubuque.
THE GREAT RIVER-0438

A timeline of significant events and vessels for the the Dubuque Boat and Boiler Works line to walkway in the Great River road Pavilion at the at the Mississippi River Center in Dubuque.
THE GREAT RIVER-0439

The Shot Tower - Lead for ammunition during the Civil War was melted at the base of the tower, hoisted to the top, poured through screens of different gauges, tumbling smoothly round as it fell into the water vats below. The shot was then sorted and packed. When completed, the tower could produce between 6 to 8 tons daily, but it was rarely operated at full capacity due to being bought by competitor Chadburne and Forster in 1862. From 1872 - 1881 a statue of Andrew Jackson on horseback stood on top of the tower. In 1877, a permanent interior spiral staircase was constructed. In 1881, a framed glass observatory was added to the top to convert it into a fire watchtower for Standard Lumber Company, which occupied seven blocks around the structure. After a fire in 1911 the building was. It stood roofless until a concrete cap with a hatchway was added in 1960 and replacement brick was used to reconstruct the lost upper portion of the top floor.
THE GREAT RIVER-0440

The dredge William M. Black, now permanently moored in the Ice Harbor in Dubuque is one of the last steamboats built with the advance technology of the 1930s, the last era before diesel power replaced steam. A side-wheeler steamboat, the Black is similar in form and style to the great steam boats of the 19th century. The vessel, which is 277 feet long and 85 feet wide, was built in 1934 by the Marietta Manufacturing Company in Point Pleasant, West Virginia for the U.S. Army Corps of Engineers.
THE GREAT RIVER-0441

The dredge pump has a 1,300 horsepower triple expansion steam engine aboard the dredge William M. Black.
THE GREAT RIVER-0442

The engineers desk stationed in front of the various pressure gauges on the dredge William M. Black.
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The brass engine order telegraph in the wheelhouse of the dredge William M. Black at the Mississippi River Center in Dubuque.
THE GREAT RIVER-0444

There are several living quarters for the crew aboard the dredge William M. Black along with storerooms, a drying room, a food preparation area and separate crew and officer’s mess, and fourteen staterooms including captain’s and engineer’s quarters.
THE GREAT RIVER-0445

A model of a steamboat that lights up in various sections of the craft as a audio tract plays telling about the structure of the vessel and what life was like aboard the ship for passengers at the Mississippi River Center in Dubuque.
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Visitors can take control of the steamboat in the life size wheelhouse at the Mississippi River Center in Dubuque.
THE GREAT RIVER-0447

The Julien Dubuque Monument stands on the edge of the bluff above Catfish Creek overlooking the Mississippi River in the Mines of Spain Recreation Area south of Dubuque, Iowa.
THE GREAT RIVER-0448

Catfish Creek is a 21.2-mile-long tributary of the upper Mississippi River in northeastern Iowa. It rises southwest of Dubuque to just southeast of Peosta. The Middle Fork rises west of Dubuque and flows under and then parallel to U.S. Route 20.
THE GREAT RIVER-0449

Passing under the Dubuque Rail Bridge on the Illinois side of the river June 29, 2017. The bridge was rebuilt in the 1890s has 5 spans and a swing-span. Because of a 150-foot bluff adjacent to the Mississippi riverbank on the Illinois side, the tracks enter a 1/4-mile tunnel that curves 90-degrees to the south allowing trains to proceed along the tracks next to the river south of the bridge.
THE GREAT RIVER-0450

Working from a deck barge in the Mississippi River crews work on piers under the Julien Dubuque Bridge between Dubuque, Iowa and East Dubuque, Illinois
THE GREAT RIVER-0451

Finished in 1943 the Julien Dubuque Bridge spans the Mississippi River between Dubuque, Iowa and East Dubuque, Illinois. Because the bridge was financed with bonds, it initially operated as a toll bridge. Proceeds were used to help pay off the bonds. In the post-war years, traffic was so heavy the bonds were paid off 11 years early, and the bridge became toll-free in 1954. In the early 1990s, the bridge underwent an extensive renovation. The deck was replaced, and a new walkway was installed. For many years, the bridge was a dark green color; recently it has been repainted to its original light gray color.
THE GREAT RIVER-0452

In the late 1700s, the Meskwakies Indian Tribe located a village near the mouth of Catfish Creek and mined LEAD in the area. In 1788 they allowed Julien Dubuque to live along the stream and operate the mines. Near the mouth of the stream, his settlement included a smelter and blacksmith shop.
THE GREAT RIVER-0453

A kayaker makes his way along a segment of the 21.2 mile long Catfish Creek a tributary of the Mississippi River south of Dubuque, Iowa.
THE GREAT RIVER-0454

A Canadian Pacific train passes below the Julien Dubuque Monument that overlooks the Mississippi River in the Mines of Spain Recreation Area south of Dubuque, Iowa.
THE GREAT RIVER-0455

Catfish Creek is a 21.2-mile-long tributary of the upper Mississippi River in northeastern Iowa. The Iowa Department of Natural Resources (IDNR) has labeled Upper Catfish Creek a cold-water Class "B"(CW) stream from the Swiss Valley Park Campgrounds and south approximately 3 miles. The stream has naturally reproducing has brown trout within it--one of only thirty such streams in Iowa.
THE GREAT RIVER-0456

Catfish Creek is a 21.2-mile-long tributary of the upper Mississippi River in northeastern Iowa. It rises southwest of Dubuque to just southeast of Peosta. The Middle Fork rises west of Dubuque and flows under and then parallel to U.S. Route 20. In the late 1700s, the Meskwakies Indian Tribe located a village near the mouth of Catfish Creek and mined LEAD in the area. In 1788 they allowed Julien Dubuque to live along the stream and operate the mines. Near the mouth of the stream, his settlement included a smelter and blacksmith shop.
THE GREAT RIVER-0457

The Horseshoe Bluff nature trail is a ¾ mile trail featuring a scenic overlook at the north end. From here you can see the Julien Dubuque monument to the north and view the old quarry to the south with the Mississippi River in the background.
THE GREAT RIVER-0458

The Mines of Spain Recreation Area and E.B.Lyons Interpretive and Nature Center are located on 1380 acres of wooded and prairie land just south of Dubuque, IA. The area has been designated as a National Historic Landmark and includes Julien Dubuque’s Monument at a point just above where Catfish Creek meets the Mississippi River.
THE GREAT RIVER-0459

A couple walks along the trail through the Horseshoe Bluff site of the Mines of Spain Recreation Area. There are 21 miles of maintained hiking trails within the park including five individual nature walks and those at the E.B. Lyons Interpretive Center.
THE GREAT RIVER-0460

A white Twayblade Orchid blooms along the trail in the Mines of Spain Recreation Area near Dubuque, Iowa.
THE GREAT RIVER-0461

A Purple Coneflower along the Horseshoe Bluff nature trail in the Mines of Spain Recreation Area near Dubuque, Iowa.
THE GREAT RIVER-0462

A Yellow Coneflower along the Horseshoe Bluff nature trail in the Mines of Spain Recreation Area near Dubuque, Iowa.
THE GREAT RIVER-0463

A Yellow Coneflower peeks out from behind a branch of Glossy Buckhorn along the Horseshoe Bluff nature trail in the Mines of Spain Recreation Area near Dubuque, Iowa.
THE GREAT RIVER-0464

Yellow Coneflowers dot the path near the Horseshoe Bluff nature trail in the Mines of Spain Recreation Area near Dubuque, Iowa.
THE GREAT RIVER-0465

Julien Dubuque married Potosa, daughter of Peosta, the chief of the Mesquakie Indians. Dubuque died in March of 1810 and when he died the Mesquakie buried him with tribal honors beneath a log mausoleum at the site of the current monument. The Julien Dubuque monument was built in 1897 and sits high above the Mississippi River.
THE GREAT RIVER-0466

Visitors to the Mines of Spain Recreational Area visit the Julien Dubuque Monument which stands on the edge of the bluff above the Mississippi River south of Dubuque, Iowa.
THE GREAT RIVER-0467

Julien Dubuque died in March of 1810 and when he died the Mesquakie buried him with tribal honors beneath a log mausoleum at the site of the current monument. The Julien Dubuque monument was built in 1897 and sits high above the Mississippi River.
THE GREAT RIVER-0468

The Julien Dubuque monument is constructed of rock-faced limestone ashlar, a Galena limestone mined from a nearby quarry. This cylindrical tower is 12 feet wide and 25 feet high with walls approximately 18 inches in width.
THE GREAT RIVER-0469

Looking southeast across the Mississippi River from the Julien Dubuque Monument in the Mines of Spain Recreation Area near Dubuque, Iowa.
THE GREAT RIVER-0470

The Dubuque area is important historically in the Indian-French fur trading culture and the first record of lead mining by a French trader, Nicholas Perrot, in 1690. In 1788 Julien Dubuque was granted rights by the Mesquakie Indians to mine their land for lead. Dubuque settled close to the village of Kettle Chief just south of where the Julien Dubuque Monument now stands. It was here that Dubuque founded the first Euro-American settlement in what is now Iowa.
THE GREAT RIVER-0471

A monument to Peosta, the chief of the Mesquakie Indians located near the Julien Dubuque Monument in the Mines of Spain Recreation Area near Dubuque, Iowa.
THE GREAT RIVER-0472

A view down Main Street near the intersection with West 11th Street is seen in downtown Dubuque, Iowa, on Tuesday, June 20, 2017.
THE GREAT RIVER-0473

A woman passes by a mural painted by a local artist in the Millwork District of Dubuque, Iowa, on Tuesday, June 20, 2017.
THE GREAT RIVER-0474

An event is seen in the courtyard of the Schmid Innovation Center in the Millwork District of Dubuque, Iowa, on Tuesday, June 20, 2017.
THE GREAT RIVER-0475

The mezzanine of the Schmid Innovation Center displays a mobile of old windows representative of the warehouseÕs history as a door and window manufacturing plant in the Millwork District of Dubuque, Iowa, on Tuesday, June 20, 2017.
THE GREAT RIVER-0476

Upscale apartments using old skybridge as balconies are seen in a reclaimed warehouse building in the Millwork District of Dubuque, Iowa, on Tuesday, June 20, 2017.
THE GREAT RIVER-0477

A barge passes under the Julien Dubuque Bridge while traveling along the Mississippi River in Dubuque, Iowa, on Thursday, June 29, 2017.
THE GREAT RIVER-0478

The Dubuque Railroad Bridge is seen from the front of a handmade wooden canoe on the Mississippi River in Dubuque, Iowa, on Thursday, June 29, 2017.
THE GREAT RIVER-0479

The Julien Dubuque Bridge is seen from behind the Dubuque Railroad Bridge on the Mississippi River in Dubuque, Iowa, on Thursday, June 29, 2017.
THE GREAT RIVER-0480

The Dubuque Railroad Bridge is seen with the swing span open for barges to pass through from on the Mississippi River in Dubuque, Iowa, on Thursday, June 29, 2017.
THE GREAT RIVER-0481

The Ice Harbor Restaurant is seen from the Port of Dubuque Marina in Dubuque, Iowa, on Thursday, June 29, 2017.
THE GREAT RIVER-0482

The Dubuque county courthouse is seen from the Port of Dubuque Marina in Dubuque, Iowa, on Thursday, June 29, 2017.
THE GREAT RIVER-0483

The William M. Black steamboat, built in 1934, is seen available for tours as a part of the National Mississippi River Museum & Aquarium in the Port of Dubuque Marina with Hotel Julien in the background in Dubuque, Iowa, on Thursday, June 29, 2017.
THE GREAT RIVER-0484

A paddler is seen passing by rock formations on Catfish Creek heading toward the main channel of the Mississippi River in Dubuque, Iowa, on Thursday, June 29, 2017.
THE GREAT RIVER-0485

A lone paddler is seen crossing under a railroad bridge on Catfish Creek heading toward the main channel of the Mississippi River in Dubuque, Iowa, on Thursday, June 29, 2017.
THE GREAT RIVER-0486

The Julien Dubuque Monument is seen above a passing train at the junction of Catfish Creek and the Mississippi River in Dubuque, Iowa, on Thursday, June 29, 2017.
THE GREAT RIVER-0487

Paddlers are seen launching from Catfish Creek Foot Trial lot landing in Dubuque, Iowa, on Thursday, June 29, 2017.
THE GREAT RIVER-0488

Mid-Town Marina in East Dubuque, Illinois, is seen on Tuesday, June 20, 2017.
THE GREAT RIVER-0489

Boaters pull into Mid-Town Marina in East Dubuque, Illinois, on Tuesday, June 20, 2017.
THE GREAT RIVER-0490

T.J.'s Bent Prop Marina Inc. is seen in East Dubuque, Illinois, on Tuesday, June 20, 2017. The location offers boat slips, rentals, a full grill menu and full bar.
THE GREAT RIVER-0491

The back patio of T.J.'s Bent Prop Marina Inc. is seen in East Dubuque, Illinois, on Tuesday, June 20, 2017. The location offers boat slips, rentals, a full grill menu and full bar.
THE GREAT RIVER-0492

Owners T.J. Freytag Jr. and Julie Hoftender pose for a photo behind the bar at T.J.'s Bent Prop Marina Inc. in East Dubuque, Illinois, on Tuesday, June 20, 2017. The location offers boat slips, rentals, a full grill menu and full bar.
THE GREAT RIVER-0493

Boats are seen stored in a grass yard in front of Mid-Town Marina in East Dubuque, Illinois, on Tuesday, June 20, 2017.