INTERPRETATION OF SUSPECTED LANDSLIDE AT PROPOSED ‘GULCH A’ BRIDGE, SOUTH ABUTMENT, US HIGHWAY 550 REALIGNMENT, DURANGO AREA, COLORADO: for Shannon and Wilson-Denver
Colorado Department of Transportation (CDOT) is planning to realign the intersection between US Highways 160 and 550, 7 km south of Durango, CO. In late 2019 one of the bidding design-build companies asked Geo-Haz to examine a suspected slump landslide in the area of a proposed bridge abutment. Field review indicated that the site had failed, but in thin slab slides of colluvium. In the evacuation area the failure plane was near the surface, so bridge piers could be placed through it and into stable material. As of March 2021, the bridge is being built.
