Photograph of the Leavenworth National Fish Hatchery surface water intake site on Icicle Creek
Important Facts About the SWISP Project
Background and Proposed Action
Reclamation proposes to rehabilitate the LNFH intake and delivery system on Icicle Creek by constructing new headworks and a creek-width, roughened channel, as well as replacing/lining the surface water conveyance pipeline to the hatchery. In addition, the current intake access road would be modified and extended to provide better entry to an expanded intake operations and maintenance area.
Construction of the headworks and roughened channel would incorporate the existing low-head diversion dam and intake channel. Self-cleaning, cylindrical fish screens would be installed at the diversion headworks, and a low-flow, boulder weir fishway would be integrated into the roughened channel. A new pipeline would be placed in the intake channel to connect the headworks to the conveyance pipeline. The intake channel would be filled to cover the pipeline and create the intake operations and maintenance area. The conveyance pipeline would be replaced on USFWS lands and lined with cure-in-place liner on private parcels. Construction of several manhole access points along the existing conveyance pipeline alignment would be installed to provide ingress and egress for pipe lining on private lands.
Construction of the SWISP Project comprises the following:
Construction of access road
Installation of temporary cofferdams
Construction of retaining walls
Construction of headworks including NMFS–compliant fish screens
Placement of new intake channel pipeline
Demolition of existing gatehouse
Construction of intake operation and maintenance area, pipeline intake/sluice management area on top of headworks, retaining walls, and existing intake channel
Construction of a roughened channel
Construction of the low-flow boulder weir fishway
Replace conveyance pipeline segments on USFWS property
Construction of manhole access points along conveyance pipeline alignment
Line conveyance pipeline segments with cure-in-place liner on private parcels
Water supply to the LNFH would be maintained during construction through either a gravity-fed bypass connected to the existing conveyance pipeline or through a pump from the stilling basin adjacent to LNFH.
The primary staging site would be located on LNFH grounds. Trucks hauling construction equipment and containing construction materials would be required to turn around approximately one mile above the project area. Access to the conveyance pipeline would use existing roads and pipeline right-of-way.
Existing Conditions
Existing conditions at the LNFH SWISP Project intake site on Icicle Creek. Key existing features include the Low-Head Diversion Dam, Intake Channel, Fish Ladder/Sediment Sluice, and Gatehouse.
Photos of Existing Conditions
Low-Head Diversion Dam and Intake Channel (above Intake-Trash Rack)
Intake Channel (below Intake-Trash Rack) and Gatehouse
Existing intake site features, from right to left: Low-Head Diversion Dam and Intake Channel, Fish Ladder/Sediment Sluice, Intake-Trash Rack, Intake Channel, and Gatehouse
Proposed Action
The figure depicts the Surface Water Intake Fish Screen and Fish Passage Project Area. The SWISP Intake Project Area is bounded by Icicle Creek Road on the north and Icicle Creek on the south. The primary components displayed at the SWISP Intake Project Area include the access road, Intake Operations and Maintenance Area, fish screens, low-head diversion dam and notch, roughened channel, low-flow boulder weir fishway, intake pipeline, Pipeline Intake/Sluice Management Area, outlet channel, and conveyance pipeline to the hatchery.
Engineered plan drawing of the LNFH SWISP Project Intake Area. The primary components displayed at the SWISP intake site include the access road, Intake Operations and Maintenance Area, fish screens, low-head diversion dam and notch, roughened channel, low-flow boulder weir fishway, intake pipeline, Pipeline Intake/Sluice Management Area (former gatehouse), and the fish return pool.
Construction disturbance boundaries for the
LNFH SWISP Project Intake Area
, including the portion of the conveyance pipeline to the hatchery that is on USFWS-owned lands. The figure shows land ownership on the project area and surrounding parcels.
Engineered plan drawing of the LNFH SWISP Project Pipeline Intake/Sluice Management Area valve configuration.
Engineered section and detail drawings of the LNFH SWISP Project Pipeline Intake/Sluice Management Area valve configurations.
For more information on the SWISP EIS, please contact Jason Sutter (208-378-5390, BOR-SHA-PNRLSWISP@usbr.gov).
To be added or removed from the mailing list, please contact Megan Stone (303-447-7160, megan.stone@empsi.com).