Caltrans, Highway 1 Timber Gulch Culvert Project

Summary

SCH Number
2010108093
Lead Agency
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa
Document Title
Caltrans, Highway 1 Timber Gulch Culvert Project
Document Type
NOE - Notice of Exemption
Received

Document Description
The purpose of the proposed project is to replace the existing culvert that was damaged in the 2005/2006 wet season and has significantly degraded due to scour. Caltrans proposed replacing the current 48-inch diameter corrugated metal pipe culvert with a 108-inch diameter steel pipe culvert. Additionally, Caltrans proposes to install new headwalls, wingwalls, and rock slope protection (RSP) with the new culvert. The newly proposed structure is designed to pass larger debris flows and prevent additional erosion and scour.

Contact Information
Jeremiah Puget
Regional Water Quality Control Board, Region 1 (North Coast), Sa
5550 Skylane Boulevard, Suite A
Santa Rosa, CA 95403

(707) 576-2835

Location

Counties
Sonoma
Other Location Info
Timber Gulch

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15301 (a)
Reasons for Exemption
Existing highway drainage system with minor impacts.
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