DN 101 Repair Slope and Repair Culvert Project


SCH Number
Public Agency
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa
Document Title
DN 101 Repair Slope and Repair Culvert Project
Document Type
NOE - Notice of Exemption
Document Description
The purpose of the project was to implement emergency repairs in order to prevent the loss of the highway due to roadway fill displacement and associated culvert failure along the portion of State Route (SR) 101, at Post Mile (PM) 21.49, in Del Norte County. At the time of repair, Caltrans contacted state and federal agency personnel and submitted a Regional General Permit 5 (RGP 5) - Emergency Permit to the Army Corps of Engineers (USACE). The USACE determined that the project did not qualify for an RGP 5. Caltrans was required to submit an application for a Nationwide Permit No. 3, Maintenance, pursuant to section 404 of the Clean Water Act, which triggered the need for a 401 certification. This certification is being issued after the fact because all ground disturbing activities have been started and completed. The project involved attaching a shorter down drain, and the setting Rock Slope Protection (RSP) within the eroded area of the highway prism. The original 80' down drain was removed, and a 30' down drain was installed. Approximately 200cy of rock was placed in the eroded area below the down drain to stabilize the slope. A 100' long access road was installed adjacent to the culvert outlet and down drain for access. All temporarily disturbed areas was revegetated upon project completion.

Contact Information

Brandon Stevens
Agency Name
Regional Water Quality Control Board, Region 1 (North Coast), Sa
Contact Types
Lead/Public Agency


Crescent City
Del Norte
State Highways
SR 101
Other Information
PM 21.49

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Class 1 - S: 15301
Reasons for Exemption
This project involves restoring existing roadway structures and replacing the existing culvert structure and incorporate energy dissipation below the roadway to decrease future degradation with de minimus increase in fill. The project will not result in an expansion of the existing use.

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, 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.

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