Upper Drainages Erosion Control Improvements

Summary

SCH Number
2020060620
Lead Agency
Caltrans, District 5 - San Luis Obispo/Santa Barbara (California Department of Transportation, District 5)
Document Title
Upper Drainages Erosion Control Improvements
Document Type
NEG - Negative Declaration
Received
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
California Department of Transportation
50 Higuera Street
San Luis Obispo, CA 93401

Phone : (805) 549-3063
Paula.Huddleston@dot.ca.gov

Location

Counties
San Mateo Santa Cruz
Regions
Countywide Northern California Unincorporated
Cross Streets
multiple
State Highways
9
Railways
none
Airports
none
Schools
none
Waterways
San Lorenzo River and tributaries
Other Location Info
Near Ben Lomond and Boulder Creek

Notice of Completion

Review Period Start
Review Period End
Development Type
Transportation:Highway/Freeway (Repair to highway drainages)
Project Issues
Aesthetic/Visual Biological Resources Drainage/Absorption Flood Plain/Flooding Noise Recreation/Parks Soil Erosion/Compaction/Grading Traffic/Circulation Vegetation Water Quality
Reviewing Agencies
California Air Resources Board California Department of Conservation California Department of Fish and Wildlife, Bay Delta Region 3 California Department of Forestry and Fire Protection California Department of Parks and Recreation California Department of Transportation, District 4 California Department of Transportation, District 5 California Department of Water Resources California Governor's Office of Emergency Services California Highway Patrol California Native American Heritage Commission California Natural Resources Agency California Regional Water Quality Control Board, Central Coast Region 3 California Regional Water Quality Control Board, San Francisco Bay Region 2 California State Lands Commission 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

Attachments

Environmental Document
Initial Study for SCr-9 Upper Drainages   PDF 3018 K NOI, Initial Study for Scr-9 Upper Drainages   DOCX 24 K SCH summary form, Initial Study for SCr-9 Upper Drainages   PDF 589 K
NOC
NOC, Initial Study for SCr-9 Upper Drainages   PDF 296 K

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