Upper Drainages Erosion Control Improvements

3 Documents in Project


SCH Number
Lead Agency
California Department of Transportation, District 5 (DOT)
Document Title
Upper Drainages Erosion Control Improvements
Document Type
NEG - Negative Declaration
Present Land Use
state highway
Document Description
The project would replace or modify drainage systems that are deteriorated and/or undersized and that are plugging, overtopping, or flooding and thereby causing erosion. The main component of these drainage systems is the cross-culvert, which is a pipe or other opening that runs under the road from one side to the other. In some locations, there are other culverts that run longitudinally off the highway shoulder, either as a subsurface pipe or a surface ditch. A few locations have downdrains, which are usually black corrugated plastic pipes that lay on the surface of a slope, directing runoff downhill. Larger culverts usually include a headwall (a short concrete wall securing the opening) at the entrance and occasionally also at the exit, although runoff enters most of the systems via an inlet grate level with the surface of the road. The project would plug and fill the old pipe culverts; install new, larger pipe culverts; place rock slope protection at outlets where needed; replace substandard inlets; and add minor paving where open ground is causing excessive sediment in the drainage system. An existing retaining wall would be rebuilt and lengthened. The Skyline-to-the-Sea Trail would be repaired where erosion has created a slipout. Guardrail would be repaired where necessary.

Contact Information

Paula Huddleston
Agency Name
California Department of Transportation
Contact Types
Lead/Public Agency


San Mateo, Santa Cruz
Countywide, Northern California, Unincorporated
Cross Streets
State Highways
San Lorenzo River and tributaries
Other Location Info
Near Ben Lomond and Boulder Creek

Notice of Completion

State Review Period Start
State Review Period End
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 Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Transportation, District 4 (DOT), California Department of Transportation, District 5 (DOT), California Department of Water Resources (DWR), California Governor's Office of Emergency Services (OES), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, Central Coast Region 3 (RWQCB), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), California State Lands Commission (SLC), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Quality, State Water Resources Control Board, Divison of Financial Assistance, California Highway Patrol (CHP)
State Reviewing Agency Comments
California Highway Patrol (CHP)
Development Types
Transportation:Highway/Freeway (Repair to highway drainages)
Project Issues
Aesthetics, Biological Resources, Drainage/Absorption, Flood Plain/Flooding, Geology/Soils, Hydrology/Water Quality, Noise, Recreation, Transportation, Vegetation


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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