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Lewis River Bridge

Depending upon funding, replacement of the Lewis River Bridge in Yellowstone National Park could begin as early as 2020 and last for more than two years.

The project was approved Dec. 21, the last day before much of the federal workforce was furloughed by President Donald Trump.

The bridge is located south of the Lewis Lake Campground on the South Entrance Road that travels to Grand Teton National Park. When construction starts, delays of 30 minutes could be normal. There may be up to six temporary road closures of up to six hours each to set bridge girders. The Lewis River Falls Overlook Trail and parking areas would be closed during construction.

The replacement will be built on a new alignment directly east of the existing bridge. 

The construction will shift the South Entrance Road several hundred feet to line up with the new bridge. Traffic will continue on the existing bridge while the new bridge is under construction. 

The replacement will be built on a new alignment directly east of the existing bridge. Parking and pedestrian areas located north and south of the existing bridge will be redesigned and reconstructed. 

The park considered two alternatives in its EA. Alternative B, the approved action, will shift the South Entrance Road several hundred feet to line up with the new bridge. Traffic will continue on the existing bridge while the new bridge is under construction. Alternative B was selected to ensure excellent bridge structure integrity into the future, improve pedestrian safety, and reduce localized vehicle congestion.

Depending upon funding, roadwork could begin as early as spring 2020 and last for two consecutive years followed by the spring of a third year. When the proposed project is implemented, construction delays would normally be limited to 30 minutes. There may be up to six temporary road closures of up to six hours each to set bridge girders. The Lewis River Falls Overlook Trail and parking areas would be closed during construction. 

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