Bristol realigned a portion of Chester Creek to remove barriers to fish passage, reconnect stream segments, reduce flooding, and improve water quality. The project included demolition, bank stabilization, new stream and pond construction, toe and slope protection, box culvert installation, erosion control, in-water work, storm drainpipe slip lining, riprap placement, straw wattles, landscaping, pavement, and concrete. 

To reroute the creek, Bristol first installed a temporary 650-foot creek diversion trench to collect flow waters from crossing culverts. Excavation activities occurred within temporary construction easements provided by the Municipality of Anchorage. Super Sacks® were placed at the beginning of the existing creek channel, preventing flow waters from re-entering the existing creek channel during the installation of the proposed storm drain system. The Super Sacks® were filled with excavated material from the temporary creek diversion and were placed to prevent breaching of flow waters. Upon completion of the new storm drain system installation, the temporary diversion trench was backfilled and compacted using the previously excavated material. The new stream channel now has an average slope of 1.5%, mimicking the natural stream channel 

This project included the challenging task of closing one of Anchorage, Alaska’s busiest intersections for 84 hours to complete box culvert and storm drain modifications. This required the Bristol team to have all materials, equipment, personnel, and back-ups ready to work 24 hours a day during a holiday weekend closure. Work was completed ahead of the scheduled closure time with no safety near misses or accidents.

Client: Municipality of Anchorage

Location: Alaska

service line: Civil Construction
contract amount: $3,500,000
Award Date: September 2014
completed date: August 2015