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Little Mill Creek Groundwater Recharge Incised Channel Repair Project (Project) (Notification of Lake or Streambed Alteration, No. EPIMS-MEN-64381-R1C)

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AI Contract Overview

The California Department of Fish and Wildlife has authorized a habitat restoration project under EPIMS Notification No. EPIMS-MEN-64381-R1C, submitted by Nicole Schmidt representing The Nature Conservancy, to address channel degradation in an unnamed tributary to Little Mill Creek within the Navarro River watershed. The project focuses on a 600-linear-foot segment where incision has reduced groundwater recharge and diminished dry season stream flow. Activities include excavation, placement of fill, construction of rock grade control structures and log sills made from felled redwood trees with root wads, removal and replacement of two culverts, and revegetation efforts. The rock structures will feature upstream clay barriers to retain water and raise the streambed to floodplain bench levels, while a 36-inch corrugated metal pipe culvert will be removed and replaced with a seasonal rocked ford crossing designed to handle a 12-foot road width and include a downstream energy dissipation pool using one-ton rock; vehicle use on the ford is prohibited when surface water is present. An additional 18-inch culvert will be relocated upstream of a log sill to improve flow dynamics and reduce erosion, with its outfall armored with rock. Revegetation efforts will reintroduce native vegetation across the restored area, including ten one-gallon coast redwood saplings, 92 native shrubs, 1,712 sedges and rushes, 306 forbs and ferns, and 400 grass plugs to stabilize soils and restore ecological function. Erosion control will be achieved through the installation of 17,640 square feet of coir blanket seeded with a native plant mix, ensuring long-term slope stability and habitat development. All work adheres to Section 1602 of the Fish and Game Code, aiming to enhance hydrologic connectivity, improve aquatic habitat conditions, and increase groundwater storage in the watershed, while minimizing environmental disturbance and ensuring compliance with state regulatory standards.

General Info

Restore 600 feet of degraded tributary with rock structures, log sills, culvert replacements, and native revegetation to improve flow and groundwater.

Agency

California → Fish and Wildlife, Region 1 - Northern Region, Redding and Eureka

NAICS

237990 - Other Heavy and Civil Engineering ConstructionView NAICS

Place of Performance

approximately 9 miles northeast of the town of Philo, CA

Set-Aside

NONE

Documents

(1)

EPIMS-MEN-64381-R1C Little Mill Creek Groundwater Recharge Incised Channel Repair Project Notice of Exemption

PDF•notice-of-exemption

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Uniform Contract Format

Timeline

PostedJul 17

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Organization & Contact Information

AgencyCalifornia → Fish and Wildlife, Region 1 - Northern Region, Redding and Eureka

Contacts2 people available

OfficeN/A

Organization / Agency

California → Fish and Wildlife, Region 1 - Northern Region, Redding and Eureka

Office AddressN/A

Contacts

Jennifer GarrisonEnvironmental Scientist

contact@example.gov

+1 (555) 000-0000

Nicole SchmidtPlease contact Jennifer Garrison of CDFW

contact@example.gov

+1 (555) 000-0000

Full Description

The California Department of Fish and Wildlife has executed Lake and Streambed Alteration Agreement EPIMS Notification No. EPIMS-MEN-64381-R1C, pursuant to Section 1602 of the Fish and Game Code to Nicole Schmidt representing The Nature Conservancy. The Project is part of the Navarro River Mill Creek Habitat Enhancement Project and is limited to one (1) encroachment to conduct restoration work within approximately 600 linear feet of an unnamed tributary to Little Mill creek to increase groundwater recharge and augment dry season stream flow in the Mill Creek watershed. Work for this encroachment will include excavation, placement of fill, log sill and rock grade structures into the channel, removal of an existing culvert and replacement with a seasonal rocked ford crossing, removal, relocation, and replacement of an existing culvert, revegetation plantings, backfilling and compaction of fill, and rock armoring as necessary to minimize erosion. Rock Grade Control and Log Sill Structures. The project will install rock grade control and log sill structures and place soil into the incised channel to develop a series of low gradient reaches and pools. Soil will be placed in the stream to raise the channel bed to the same elevation as the floodplain benches. The rock structures will be installed in the steeper stream reaches and will include a clay barrier on the upstream side to minimize water leakage through the structure and maximize upstream water retention. Two felled redwood trees (30-inch and 40-inch diameter at breast height [dbh]) will be cut into lengths to create the log sill structures, which will also incorporate the trees root wads. Culvert Removal and Installation of Rock Ford Crossing. An existing 36-inch diameter corrugated metal pipe (CMP) culvert on the downstream end of the project site will be removed and replaced with a rocked stream crossing. The rocked crossing will accommodate a 12-foot road width and will include the placement of one-ton rock on the downstream side to create an energy dissipation pool to reduce erosion. Vehicles shall not be operated on the ford crossing when surface water is present. Culvert Relocation. An existing 18-inch diameter CMP culvert that conveys flow to the stream from the access road will be removed, replaced, and relocated to discharge upstream of a log sill structure. The outfall will be rocked to reduce erosion in the channel. Revegetation and Erosion Control. Revegetation includes ten (10) one-gallon redwood plantings, 92 native shrub plantings, 1,712 sedges and rushes plantings, 306 forbs and ferns, and 400 grass plugs.. Erosion control treatments include installation of 17,640 square feet of coir blanket and native plant seed mix.