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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 2nd Avenue bridge over St. Vrain Creek will be closed starting on or around December 7 through May 2021 for full replacement. Project completion is anticipated in summer 2021.

2nd Ave. Bridge Site Plan >>

What's happening this week? (11/23-12/4)
The contractor will continue to mobilize equipment and materials to the work zone, install erosion control measures, place traffic signs, and construct new access points to the 2nd Avenue alley. No work is planned 11/26-11/29 (extended Thanksgiving weekend).

What’s coming in the next few weeks? (11/30-12/4 and 12/7-12/11)
Permanent access modifications are planned for the 2nd Avenue alley south of Park Street and west of 2nd Avenue. The contractor will construct a new permanent alley on Town property located at 221 Park Street. Starting on or after December 7, the 2nd Avenue alley will permanently close at 2nd Avenue. Access to several 2nd Avenue properties will be provided through a new permanent alley currently under construction at 221 Park Street.

Temporary access modifications are also planned for the 2nd Avenue alley south of Park Street and east of 2nd Avenue. Starting on or after December 7, access to several 2nd Avenue properties will be provided through a temporary alley access constructed on Town property located at 117 Park Street.

The 2nd Avenue bridge over St. Vrain Creek will be closed for full replacement starting on or around December 7 through May 2021. More information and detour maps to follow.

Traffic Impacts 
2nd Avenue will be closed to all traffic at St. Vrain Creek for approximately six months. The signed detour route utilizes Park Street, Ute Highway (U.S. 36), and McConnell Drive. Access to all properties will be maintained. 

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

Schedule 
November 2020 - Mobilization, initial work begins
December 2020 - Construct new 2nd Avenue alley (west) access and temporary (east) access), close 2nd Avenue bridge and 2nd Avenue alley, bridge demolition, clearing & grubbing

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.


With questions, please contact Flood Recovery Manager, Tracy Sanders.

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