State Route 1/84 Structures and Scour Mitigation Project

4 Documents in Project


SCH Number
Lead Agency
California Department of Transportation, District 4 (DOT)
Document Title
State Route 1/84 Structures and Scour Mitigation Project
Document Type
FIN - Final Document
Present Land Use
Both locations of the project are bridges.
Document Description
The California Department of Transportation (Caltrans) District 4 proposes to protect the Pilarcitos Creek Bridges on State Route 1, post mile 28.92, and the San Gregorio Creek Bridge on State Route 84, post mile 7.55. The bridges will be protected from scour by placing partially grouted rock slope protection (RSP). At the Pilarcitos Creek Bridges, an existing log jam will be removed and partially grouted RSP will be placed around piers of the northbound and southbound bridges and will replace the earth stream bank, and slope, between Pilarcitos Creek and the northern abutments of both bridges. The existing public trail along the north bank of Pilarcitos Creek will be removed during construction and replaced in kind at project completion. At the San Gregorio Creek Bridge, partially grouted RSP will be placed under the west end of the bridge along the slope between Pier 2 and Abutment 1 to restore the slope to a ratio no steeper than 1.5 horizontal to 1.0 vertical; and to construct a key around Pier 2 that will be filled with partially grouted RSP to protect the pier from erosion.

Contact Information

Zachary Gifford
Agency Name
Caltrans, District 4
Contact Types
Lead/Public Agency


Half Moon Bay, San Mateo
San Mateo
San Francisco Bay Area
State Highways
State Route 1 and State Route 84
Other Location Info
Postmile 28.9 and Postmile 7.55

Notice of Completion

State Reviewing Agencies
California Air Resources Board (ARB), California Coastal Commission (CCC), California Department of Conservation (DOC), California Department of Fish and Wildlife, Marin Region 7 (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 State Parks, Division of Boating and Waterways, 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 Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), California State Lands Commission (SLC), Department of Toxic Substances Control, Office of Historic Preservation, State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Division of Water Rights
Development Types
Transportation:Other (Bridge scour maintenance)
Local Actions
Coastal Permit
Project Issues
Aesthetics, Air Quality, Biological Resources, Coastal Zone, Drainage/Absorption, Flood Plain/Flooding, Noise, Public Services, Recreation, Transportation, Vegetation, Wetland/Riparian, construction related impacts


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 or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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