Pine Hill Road Swain Slough Bridge Replacement Project (Lake or Streambed Alteration Agreement No. 1600-2018-0449-R1)
Summary
SCH Number
2021010350
Public Agency
Humboldt County
Document Title
Pine Hill Road Swain Slough Bridge Replacement Project (Lake or Streambed Alteration Agreement No. 1600-2018-0449-R1)
Document Type
NOE - Notice of Exemption
Received
Posted
1/28/2021
Document Description
This Agreement relies on the Notification materials and CDFW site inspections by
Environmental Scientist Greg O’Connell on January 28, 2020, and February 05, 2020. The project is limited to one
encroachment (Table 1). The encroachment is for the replacement of a three-span timber-stringer County bridge
over Swain Slough on Pine Street. The project entails removing an existing municipal water line attached to the
existing bridge and relocating the water line underground using horizontal directional drilling (HDD) technology.
After the water line is relocated, the existing bridge and support structures will be removed prior to the installation
of new abutments and a single span concrete deck bridge. The project includes a non-standard design element for
hydraulic clearance. The proposed bridge deck has been designed to remain dry during the 100-year flow;
however, the Notification proposes a soffit elevation 2.6 feet below 50-year flood water surface elevations and 3.2
feet below 100-year elevations. The Notification suggests Swain Slough, Martin Slough, and Elk River form one
large backwater during high flow events coupled with high tides. Under these circumstances the bridge is not
accessible due to flooding from the adjacent County roads. The Notification states that conveyance under the
bridge is not a limiting factor because each of these waterways exceed their banks during high flows. However, the
proposed bridge footings have been sized for a taller bridge and jacking points have been detailed in the design
plans to facilitate elevating the bridge to accommodate modifications for future sea level rise
Contact Information
Name
Greg O'Connell
Agency Name
California Department of Fish & Wildlife
Contact Types
Lead/Public Agency
Address
Phone
Name
Agency Name
Andrew Bundschuh
Contact Types
Project Applicant
Location
Cities
Eureka
Counties
Humboldt
Regions
Northern California
Cross Streets
Elk River watershed, approximately 3.5 miles S.5 miles S/SW of the town of Eureka, County of Hum
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Type – Class 2; California Code of Regulations, Title 14, Section 15302
Reasons for Exemption
The project replaces an existing structure where the new structure will be
located on the same site as the structure replaced and will have substantially the same purpose and capacity as the
structure replaced. There would be no significant adverse impact on endangered, threatened, or rare species or
their habitat pursuant to §15065. There are no hazardous materials at or around the project site that may be
disturbed or removed. The project will not result in impacts that are significant when viewed in connection with the
effects of past projects, the effects of other current projects, and the effects of probable future projects.
Attachments
Notice of Exemption
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