Wind River Bridge Painting
OBEC rehabilitated two bridges in Skamania County that included complete recoating of the steel structures. The larger of the two bridges, the Conrad-Lundy, was a 600-foot-long deck truss with a central 200-foot-tall tower over the Wind River. The Lundy Bridge was fully contained so the existing lead paint system could be removed and the deck truss and tower recoated. The project also included replacing the existing modular joints and upgrading the deck drain system.
The second bridge was the Moore Bridge, a 50-foot-long girder bridge. The Moore Bridge consisted solely of removing an existing lead coating system and recoating the steel girders. OBEC staff provided both bridge engineering services during the design phase and contract management/administration and inspection during the construction phase.
- The project was delivered in just 10 months. OBEC determined that retrofit strategies were not necessary and returned $80,000 (26%) of funds from the CE phase back to the client.
- Through structural analysis, the OBEC team studied the probable effects of a fully-sheathed bridge in the environment of the canyon to determine the safety and measures to mitigate risks during the recoating.
- OBEC performed preliminary analysis for the 1,000-year (UL Ground Motion) return period seismicity to assess Phase 1 & 2 vulnerabilities and deficiencies for the County to consider as part of future funding priorities. GT Strudl was used to model the two-span steel truss and center steel tower. The analysis demonstrated the bridge is flexible (long period) and lightweight, thus it is inherently resistant to seismic events. All work complied with AASHTO LRFD and the WSDOT Bridge Design Manual.