Road Work / Bridge Work Mosquito Road Bridge Replacement Road Closure

Published on May 20, 2026

El Dorado County to Perform Road, Bridge Work Mosquito Road Bridge Replacement

Road Closure from May 30, 2026 through August 7, 2026

(PLACERVILLE, CA) - El Dorado County’s Department of Transportation (DOT) will be performing structures, drainage, materials deliveries, crane maintenance, road maintenance, and bridge maintenance work on Mosquito Road from 0.6 miles north to 0.8 miles south of the Mosquito Road Bridge. The construction work will require full closure of Mosquito Road at the gates beginning Saturday, May 30, 2026, and continue through Friday, August 7, 2026, while school is out of session. A detour has been established via Rock Creek Road for which motorists should expect delays and allow extra time for travel.

The closure is necessary to ensure motorist and worker safety while the County’s Contractor performs drainage system installations, structures concrete placements, materials deliveries, and miscellaneous Contract work for the Project that is on or adjacent to Mosquito Road. The County DOT Road Maintenance Crew will be performing weekly inspections and pothole repairs on Mosquito Road throughout the summer closure and year. The County DOT Bridge Crew will also be performing annual bridge maintenance work on the Mosquito Road Bridge while the roadway is closed.

All work will allow for emergency access at the end of each shift and on weekends in the event of an emergency or evacuation. The exceptions will be during crane maintenance, and/or any structural member replacement that will keep the old Mosquito Bridge closed until the bridge is structurally safe to allow access, in which case the County will update Emergency Services in advance. In the event of an evacuation, work will shut down to accommodate Emergency Services and public traffic.

During the full closure work, Project activities adjacent to Mosquito Road will require intermittent reversing traffic controls, flaggers, construction signs, changeable message boards, and piloted semi-truck/trailer loads. Various locations of Mosquito Road will utilize these traffic controls as needed from Union Ridge Road to Rock Creek Road and may also include the dirt road access to Quintette Fire Station. Traffic stops are intended to be a maximum of ten minutes but could take 20 minutes depending upon traffic of slow-moving equipment and wide loads. Traffic will be released as soon as there is safe travel through the work zones. The public should anticipate delays, drive the posted speed limits, stop for flaggers, and anticipate slowdowns in work zones.

The County sincerely appreciates the cooperation and patience of motorists that use this roadway, and we apologize for any inconvenience these closures cause.

For questions regarding this closure, please contact the County’s Transportation main line at (530) 621-5900 (select Option 3 for Engineering).

View/Print Detour Map(PDF, 541KB)

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