SCH Number 2015102029

Project Info

Title

Coffee Creek Rd @ Coffee & Adams Creeks & Ramshorn Rd @ Mumbo Creek Bridge Replacements

Description

Trinity County, in Cooperation with the Federal Highway Administration (FHWA) Central Federal Lands Highway Division, is proposing to replace three existing bridges: 5C-048 over Coffee Creek on Coffee Road, 5C-196 over Adams Creek on Coffee Creek Road and 5C-061 over Mumbo Creek on Ramshorn Road. New bridges would improve public safety for traffic crossing Adams Creek, Coffee Creek, and Mumbo Creek by replacing functionally obsolete and/or structurally deficient bridges with new one lane structures that meet current design standards. To meet design standards, each proposed bridge structure would be 20 ft wide, consisting of one 16-ft travel lane and two 2-ft railings. The structure design for each bridge would accommodate a 50-yr flood event with 2 ft of freeboard; i.e., the low-beam elevation for the new structure would be at least 2 ft higher than the 50-yr flood elevation. Minor approach work totaling no more than 350 ft from each end of the bridge abutments is anticipated, with the potential for improvements to enhance curvature and sight distance. Aggregate would be placed on the roadways.

2 documents in project