Willow Slough Bridge Replacement Project

3 Documents in Project


SCH Number
Lead Agency
California Department of Transportation, District 3 (DOT)
Document Title
Willow Slough Bridge Replacement Project
Document Type
FIN - Final Document
Document Description
The California Department of Transportation (Caltrans) proposes to replace the existing southbound Willow Slough Bridge (Br. No. 24-0046L) with a new bridge on State Route (SR) 99 from post mile (PM) 6.04 through 7.06, approximately 6 miles north of the Sacramento and San Joaquin County line. The proposed scope of work includes constructing a new bridge to match the existing northbound bridge elevation (Right Bridge, Br. No. 24-0046R) at Willow Slough. In addition, this project will install Traffic Management System (TMS) elements including a Type III-AF service equipment enclosure, a high-speed weigh-in-motion system controller and cabinet, and closed-circuit television camera on a 90-foot-tall pole, install microwave vehicle detection system (MVDS), and install one maintenance vehicle pullover (MVP). The existing Thrie beam guardrail would be reconstructed, the metal beam guardrail would be upgraded, and a Type 842 Concrete Barrier would be constructed on both sides of the new southbound bridge. This project will also patch rock pockets in the Reinforced Concrete (RC) columns of the Right Bridge as a preventative maintenance.

Contact Information

Veronica Wilson
Agency Name
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency


Elk Grove, Sacramento
Northern California
Cross Streets
State Route 99 post miles 6.04-7.06, south of Dillard Rd.
State Highways
State Route 99
Willow Slough

Notice of Completion

State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Fish and Wildlife, North Central Region 2 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Transportation, District 3 (DOT), California Department of Water Resources (DWR), California Governor's Office of Emergency Services (OES), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Central Valley Sacramento Region 5 (RWQCB), California State Lands Commission (SLC), California Transportation Commission (CATC), Central Valley Flood Protection Board, Delta Protection Commission, Delta Stewardship Council, Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality
Development Types
Transportation:Highway/Freeway (State Route 99 Bridge Replacement)
Local Actions
Bridge Replacement
Project Issues
Biological Resources, Greenhouse Gas Emissions, Hydrology/Water Quality, Wetland/Riparian


Final Document(s) [Approved_Certified draft environmental documents]

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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