Potlatch River/Dutch Flat Dam Removal
Salmonid Habitat Restoration and Acquisition
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010 11 CW | Snake River | 10/22/2012 | 12/31/2015 | 2011 | Completed | 01/14/2025 | |
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Description
The Dutch Flat Dam owned by the City of Troy was removed during the 2013 field season. Dam removal was undertaken by the City of Troy through a contract with the Latah Soil and Water Conservation District (Latah SWCD) using PCSRF funding through the Idaho Office of Species Conservation and Bonneville Power Administration funding. The dam was a complete passage barrier for steelhead to approximately 35 miles of stream in the upper portions of the West Fork Little Bear Creek in the Potlatch River drainage, though not all of these stream miles are suitable for steelhead spawning. Partial passage barriers exist above the former dam site and were also addressed by this project.
In the early stages of this project, funds from the Latah SWCD Bonneville Accord project, which was used as non-federal match, needed to be expended more quickly than the PCSRF contract funds due to contract term constraints. The result of this was that an additional $106,623 from the Bonneville Accord contract was spent on the project than was originally proposed. Savings related to reduced costs from the originally estimated need for fill removal and disposal from the Dutch Flat dam site resulted in additional available funds and an opportunity for the Latah SWCD to request an expanded scope of work for the PCSRF project contract without requiring an increase in funds. This request was approved.
The expanded contract scope enabled the Latah SWCD to conduct a culvert survey in 2014 upstream of the dam removal site. Based on this survey and fish distribution survey work conducted by Idaho Department of Fish and Game after removal of the dam, the Latah District was able to replace two partial passage barrier culverts immediately upstream of the Dutch Flat Dam site. These culverts were replaced during the 2015 field season by the North Latah County Highway District (NLCHD) under contract with the Latah SWCD. The NLCHD in-kind contribution to this project was $71,547.
The additional Bonneville and NLCHD contributions for this project increased the non-federal match by $178,170 from the original proposed project budget.
The decrease of fill removed from the Dutch Flat Dam site also decreased the actual length of stream and riparian area treated than that originally proposed.
In total there were three passage barriers removed: The Dutch Flat Dam opened one mile to the next barriers; these two road culverts were replaced, which collectively made an additional 12 miles of stream accessible to steelhead. Metric C2f3 reports 13 miles made accessible because there is no C2c metric to report miles made accessible.
At the dam removal site there was 3.1 acres (C5c3) of riparian area planted along 0.30 miles of streambank (C5c4) (both sides of stream), using the following native species: Achiillea millefolium, Agrostis exarata, Alnus incana, Amelanchier alnifolia, Bromus marginatus, Calamagrostis Canadensis, Carex lenticularis, Carex nebrascensis, Carex simulate, Carex vesicara, Clarkia pulchella, Collomia grandiflora, Cornus sericea, Redosier, Crataegus douglasii, Deschampsia caespitosa, Deschampsia elongate, Festuca idahoensis, Galium boreale, Geum triflorum, Heracleum maximum, Koeleria macrantha, Linum lewisii, Lomatium triternatum, Lupinus laxiflorus, Lupinus polyphyllus, Lupinus sericeus, Penstemon attenuates, Penstemon globosus, Philadelphus lewisii, Physocarpus capitatus, Pinus contorta, Populus balsamifera, Populus tremuloides, Potentilla arguta, Potentilla gracilis, Prunus virginiana, Pseudoroegneria spicata, Rosa woodsii, Salix bebbiana, Salix drummondiana, Salix prolix, Salix scouleriana, Scirpus microcarpa, Senecio hydrophilus, Sidalcea oregano, Solidago missouriensis, Spirea douglasii, Symphoricarpos albus, Symphyotrichum spathulatum, Thermopsis Montana, and Wyethia amplexicaulis.
All work reported under this contract is reported at one worksite because the three sequential passage barriers are within a strea
Project Benefit
Removal of the Dutch Flat Dam would allow wild steelhead migration to an additional 7,600 acres and approximately 35 stream miles of the watershed. Fish passage to upper West Fork Little Bear Creek will be enhanced and steelhead spawning, incubation, and rearing are expected to improve from implementation of this project.
Accomplishments
Riparian Habitat |
Stream Miles Treated |
.30 |
.56 |
Acres Treated |
3.1 |
10.0 |
Fish Passage |
Barriers Removed |
1 |
1 |
Miles Opened |
13.00 |
35.00 |
Funding Details |
PCSRF | $508,837 |
Other | $284,696 |
In-Kind Other | $71,547 |
Report Total: | $865,080 |
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Worksites
Dutch Flat Dam
- Worksite Identifier: Dutch Flat Dam
- Start Date: 01/01/2013
- End Date: 12/31/2015
Area Description
Clearwater Subbasin, 17060306, West Fork of Little Bear Creek (170603060402)
Location Information
- Basin: Clearwater (170603)
- Subbasin: Clearwater (17060306)
- Watershed:
- Subwatershed:
- State: Idaho
- Recovery Domain: Snake River
- Latitude: 46.742952
- Longitude: -116.78518
ESU
- Snake River Basin Steelhead DPS
Map
Photos
Metrics
Metrics
- C.0
Salmonid Habitat Restoration and AcquisitionY (Y/N)
- . . C.0.a
Habitat restoration and acquisition funding 865,080.00
- . . C.0.b
Length of stream treated/protected .15
- . . C.0.c
Project identified in a Plan or Watershed Assessment | |
1. Project aligns with NMFS. 2015. Proposed ESA Idaho Chinook Spring/Summer Chinook Salmon and Steelhead populations. West Coast Region. Portland, Oregon 2. Potlatch River Watershed Management Plan, Latah SWCD, 2007, Latah SWCD, Moscow, Id |
- . . C.0.d.1
Project Monitoring (LOV)
- . . C.0.d.2
Monitoring Location (LOV)
- . . C.2
Fish Passage ImprovementY (Y/N)
- . . . . C.2.a
Fish Passage Funding 691,476.00
- . . . . C.2.b.1
Length of stream made accessible 13.00
- . . . . C.2.b.3
Type of blockage/barrier (LOV)
- . . . . C.2.b.4
Number of blockages/impediments/barriers impeding passage 3
- . . . . C.2.c.1
Fish passage blockages removed or altered (other than road crossings reported in C.2.f to C.2.i)Y (Y/N)
- . . . . . . C.2.c.2
Number of blockages/impediments/barriers removed/altered 1
- . . . . C.2.f.1
Culvert installed or improved at road stream crossingY (Y/N)
- . . . . . . C.2.f.2
Number of culverts installed or improved 2
- . . . . . . C.2.f.3
Miles of stream made accessible by culvert installation/upgrade 13.00
- . . C.5
Riparian Habitat ProjectY (Y/N)
- . . . . C.5.a
Riparian Habitat Funding 173,604.00
- . . . . C.5.b.1
Total riparian miles streambank treated .30
- . . . . C.5.b.2
Total Riparian Acres Treated 3.1
- . . . . C.5.c.1
Riparian plantingY (Y/N)
- . . . . . . C.5.c.2
Species of plants planted in riparian | |
Achiillea millefolium, Agrostis exarata, Alnus incana, Amelanchier alnifolia, Bromus marginatus, Calamagrostis Canadensis, Carex lenticularis, Carex nebrascensis, Carex simulate, Carex vesicara Inflated, Clarkia pulchella, Collomia grandiflora, Cornus sericea, Redosier, Crataegus douglasii, Deschampsia caespitosa, Deschampsia elongate, Festuca idahoensis, Galium boreale, Geum triflorum, Heracleum maximum, Koeleria macrantha, Linum lewisii, Lomatium triternatum, Lupinus laxiflorus, Lupinus polyphyllus, Lupinus sericeus, Penstemon attenuates, Penstemon globosus, Philadelphus lewisii, Physocarpus capitatus, Pinus contorta, Populus balsamifera, Populus tremuloides, Potentilla arguta, Potentilla gracilis, Prunus virginiana, Pseudoroegneria spicata, Rosa woodsii, Salix bebbiana, Salix drummondiana, Salix prolix, Salix scouleriana, Scirpus microcarpa, Senecio hydrophilus, Sidalcea oregano, Solidago missouriensis, Spirea douglasii, Symphoricarpos albus, Symphyotrichum spathulatum, Thermopsis Montana, and Wyethia amplexicaulis |
- . . . . . . C.5.c.3
Acres planted in riparian 3.1
- . . . . . . C.5.c.4
Miles of streambank treated with riparian planting .30
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