DESCRIPTION
This project replaced 2 eight foot culverts with a single span bridge on Beaver Creek. The Beaver Creek and Frazer Creek (tributary to Beaver Creek) drainages experienced significant disturbance in July as the result of lightning-caused wild fire, and in August from two separate mudslide / slope failure events. The BAER review for the watersheds indicates that both creeks are likely to experience dramatically increased flows following rain events, together with a substantial sediment load and debris flows, for the next 3-5 years. The mud / debris flow which occurred on August 20 following heavy rain, resulted in a debris plug at the Stokes culverts on Beaver Creek. This crossing is located approximately 500 feet downstream from the point at which Frazer Creek empties into Beaver Creek. The plugged culverts resulted in over-bank flooding downstream of the crossing, destroying adjacent riparian habitat. Debris material backed up above the crossing for about 50 feet. Without modification, it is likely that this form of maintenance will continue to be necessary following each subsequent rain event. Consequently, that portion of Beaver Creek lying downstream of the access crossing (about 3 miles) will not receive the benefit of the natural accumulation of woody debris, and could impede fish passage if the maintenance on the current culverts is not maintained. The Stokes Bridge on Beaver Creek was funded via BPA Accords/Colville Confederated Tribes under BPA project 2007-224-00, Co
In June of 2014, Methow Salmon Recovery Foundation (MSRF) was finalizing our project completion narrative for projects completed in Upper Beaver Creek. The draft started out "After nearly 15 years of projects, by more than a dozen sponsors and partners, we are almost done with our restoration work on Beaver Creek." However, this long-anticipated achievement changed dramatically in July 2014 with a one-two punch from devastating fires and subsequent floods and debris flows on Beaver Creek and Frazer Creek, a primary tributary.
MSRF staff completed multiple site visits over the next two months to identify where completed projects were directly impacted by fire or flood and potential sites where we expected additional impacts to occur based on observable damages. The US Forest Service (USFS) Burned Area Emergency Response (BAER) Team was concurrently completing a larger emergency response evaluation for the burn area and Washington Department of Transportation (DOT) was evaluating actions needed to re-open and stabilize segments of WA State Highway 20 damaged in the fire zone.
DOT was also leading efforts to restore a number of private access connections to the highway that crossed Frazer Creek. Repair efforts were initiated by DOT in early August, but were quickly challenged by rain-on-burn-area flooding in mid-August. In response to the second wave of flooding impacts, WA Department of Fish and Wildlife (WDFW) requested MSRF's assistance in securing funding to increase the capacity of culverts / bridges needed to restore the damaged private crossings.
(For an interesting view, http://vimeo.com/104463724 is a aerial video of the area's fire and flood damage. Frazer Creek is featured from minutes 1:08 through 4:5)
RCO Phase I:
On September 8, 2014, MSRF made an on-site presentation to members of the Recreation and Conservation Office (RCO) and a group of other agency and emergency response staff to seek funding support to replace five failed crossings on Frazer Creek. The request was outside of the normal Salmon Recovery Funding Board (SRFB) funding solicitation process, but was well received and funding was secured in short order with a contract signed on October 23, 2014. Work was started immediately and the first set of bridges was largely completed before snowfall in November 2014.
MSRF used awarded funding from the RCO to replace five damaged and/or buried culverts with bridges on Frazer Creek, a tributary to Beaver Creek and the Methow River, which contains ESA-listed steelhead, bull trout and resident trout. The initial five bridges of Phase 1 are detailed below.
The first site (Maltais) used Family Forest Fish Passage Program (FFFPP) funds to replace a buried culvert with a 50-foot steel bridge. The bridge site has now weathered four full years well with no deformation or fish passage concerns. MSRF completed adaptive repairs below the bridge in 2019 to address erosion concerns identified by the landowner.
Sites two through five (Miller, Risley, Bauer and Kartevold) utilized SRFB and WA DOT funds to replace four culverts, downstream of the FFFPP site, with 40-foot steel bridges. All bridges were manufactured by RTI Fabrication of Plains, Montana. Engineering for the bridge siting and placement was provided by Chinook Engineering of Coupeville, Washington.
No additional work has been required at Risley or Bauer. Clearing of flood debris was required at Miller in 2015, but not since. The Kartevold bridge has been stable and has not required any adaptive repairs to maintain access. Bed incision has been a concern below the new bridge, and adaptive repairs may be needed to maintain fish passage if incision continues.
RCO Phase 2:
During the first Phase 1 efforts, MSRF and DOT identified the need for five additional crossings to be replaced. In November 2014, MSRF sought funding for replacement of four additional culverts on Frazer Creek and one on Beaver Creek that WDFW identified as undersize