For 8 years, from September 1997 until September 2005, the Highway 19 Missouri River Bridge Transportation Corporation and the Missouri Department of Transportation have worked for a new Missouri River Bridge at Hermann. With the help of the Transportation Corporation, Senator Bond secured $13 million toward its construction. Congressman Kenny Hulshof secured $1.1 million early in the project to help pay for its design. This project was made possible through the dedicated people who gave countless hours of time and contributions.
LOCATION – The new bridge will be located to the west of the current bridge approximately 50 ft. from center to center, but only will be 12 ft. west of the current very narrow bridge that opened in 1930. The deck elevation is 80 ft. above the surface of the water. Click here to enlarge
DESIGN - The design is for a plate-girder bridge that will further define the heritage of the community for generations to come. This bridge was designed to a higher seismic category than typical bridges in the area because it is a major river crossing. The solid concrete piers will have a stone-block appearance. Forty historical lights, matching the lighting in Hermann will be installed on the bridge. The spun concrete light poles will have a salt and pepper etched surface and will be topped with acorn-shaped luninaires. Bridge railings will be a combination of concrete, also with a stone-block appearance, and aesthetic steel.
WIDTH - At 55 feet 4 inches wide, the new bridge includes two 12 ft. driving lanes, two 10 ft. shoulders, one 8 ft. bike/pedestrian lane and a concrete-safety barrier separating the bike/pedestrian lane from traffic. There will also be three 26 ft. long, 3 ft. wide pedestrian overlooks off of the bike/pedestrian lane. The old bridge has a 20 ft. deck width.
LENGTH - The overall length of the bridge is approximately 2,247 ft. The old bridge is 2,231.3 ft. in length.
COST – The estimated cost for bridge construction is almost $33 million. The old bridge cost $800,000, according to the engineer’s estimate in our files.
STEEL - 12 million pounds of structural and reinforcing steel will be used, not including the bridge railing and sign supports.
CONCRETE - 30,000 tons or 15,000 cubic yards of concrete will be used to construct the footings, piers and deck.
PIER CONSTRUCTION – The first step to pier construction is to build an enclosed area in the water to keep water out of the workspace. This is called a cofferdam. A cofferdam is a steel box in the river that provides a secure work area below the waterline for construction of the bridge's foundation. Due to the tremendous amount of pressure on the cofferdam, the cofferdam does not provide a watertight work environment and pumps are used to keep water out of the structure. After this structure is completed and water is pumped out, the riverbed is excavated and pier footings are poured. Next comes the column, then the pier cap. Cofferdams will be required for each pier in the water. There are five river piers.
STAGES OF CONSTRUCTION – The construction of the new bridge will be performed in three stages:
Stage 1 – Build the western portion of the
Route 19/100 intersection and river bridge from Route 100 to the south Missouri River bank, the bridge across the river, the embankment between the Missouri and Loutre River bridges, and build the western portion of the Loutre River Bridge. When working at the Route 19/100 intersection, a portion of the median island will be temporarily
removed and surfaced to handle traffic. During this phase traffic will be using the existing Missouri River Bridge.
Stage 2 – At this time, northbound traffic will be using the existing bridge and southbound traffic will be on the new bridge while crews complete the remainder of the Missouri River Bridge at the south end and the center
portion of the Loutre River Bridge.
Stage 3 – All traffic will be using the new bridge while work is completed at the Route 19/100 intersection, which included restoration of the median island and the eastern portion of the Loutre River Bridge.