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Posted on: November 6, 2020

2nd Avenue Bridge Replacement Project Updates

2nd Ave bridge - August 2020_1, credit RockSol

This project will replace the existing 2nd Avenue bridge over St. Vrain Creek to better accommodate future flood events. The bridge is closed to all traffic, including vehicle, pedestrian, and cycling, through May 2021. The 2nd Avenue alley access from 2nd Avenue is also closed. 

Access to 207 – 215 and 403 2nd Avenue is provided through a new permanent alley at 221 Park Street. Access to194 and 196 2nd Avenue is provided through a temporary alley access constructed on Town property located at 117 Park Street. Refer to the maps below.

2nd Avenue Road Closures and Detour Map >>

Trail Closures and Detour Map >>

2nd Avenue Alley Access Map >>


What’s happening this week? (1/18-1/22)
The contractor will continue utility work (storm sewer, sanitary sewer and electrical). Excavation work is on-going. Retaining wall installation begins on the south side of the creek.  

What’s happening next week? (1/25-1/29)
Retaining wall work continues. Excavation and grading for the trail under the bridge is anticipated. 2nd Avenue & Park Street intersection reconstruction resumes with placing new material and forming curb & gutter.

What’s coming in the next few weeks? (2/1-2/5)
Retaining wall work continues. 2nd Avenue & Retaining wall and trail work continues. 2nd Avenue & Park Street intersection work nears completion with a temporary driving surface (reopening date TBD). The contractor team will prepare the area for delivering and placing the new bridge girders.  

Schedule
December 2020 - Constructed new 2nd Avenue alley access, closed 2nd Avenue bridge and 2nd Avenue alley, demolished bridge
January 2020 – Construct retaining walls, install erosion control and bridge protection (rip rap), construct trail under bridge, place bridge girders (tentative).

Traffic Impacts 
2nd Avenue will be closed to all traffic at St. Vrain Creek for approximately six months, from December 2020 through May 2021. The Park Street / 2nd Avenue intersection is also closed for several months for full reconstruction. Access to Bohn Park and the Recycling Center is possible from the south side of the bridge. Please follow the detour route utilizing U.S. 36 and McConnell Drive to access properties on either side of the bridge. 

All work is weather-dependent and the schedule is subject to change.

Background
Heavy rain and flooding in September 2013 caused debris to build up around bridge piers and water to breach the banks of the St. Vrain Creek. The flood event caused bridge scouring, erosion, and significant damage to infrastructure downstream. The Town was awarded FEMA mitigation funds to build a new single-span bridge designed to handle 100-year flood events. The new bridge will be longer and taller to eliminate obstructions and accommodate design flow rates.

Bridge work includes removing channel sediment, debris, and the damaged bridge structure. Construction will require installing cofferdams in the creek, excavating trenches for reinforced concrete footings, driving steel piles, and compacting backfill materials. Bridge approach work includes removing and replacing asphalt, curb and gutter, sidewalk, pavement structure, storm systems, bridge abutments, and signing and striping.

Zak Dirt Inc. was awarded the construction contract for $3.3 million by the Board of Trustees on September 8, 2020.

2nd Ave. Bridge Site Plan >>
With questions, please contact Flood Recovery Manager, Tracy Sanders.

Project Progress Photos

1. 2nd Ave bridge - August 2020_1, credit RockSol

2. 2nd Ave bridge - August 2020_2, credit RockSol

4. Before - bridge deck

6. Before - bridge under
5. Before - bridge side

8. Bridge demo side

10. Bridge demo deck


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