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Work Element Summary PDF
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Contract Number:
74017 REL 100
Contract Title:
2010-077-00 EXP TUCANNON (TUMALUM) BUILD: PASSAGE AND COMPLEXITY
Contract Start Date:
4/1/2022
Contract End Date:
12/31/2024
WE ID:
184. Install Fish Passage Structure
Work Element Usage Report
Title:
F: 184 - Tumalum Creek (Construction): Replace Culvert to Eliminate Barrier and Restore Passage
Description:
Replacement of the existing culvert with a bottomless arch or concrete box culvert and a roughened channel.

Background: Tumalum Creek flows through a 65 feet long, 10 feet wide by 7 feet rise arch culvert that was installed with a slope = 0.0145 under the Tucannon River Road in 1996, after a large flood. The culvert was an improvement - reducing flood impacts and providing better conditions for upstream fish passage of steelhead trout and other native fish species; but the culvert outlet is now perched at low-flow and its bottom is clean of any substrate. As a consequence, the culvert has a relatively narrow upstream passage flow window that is depth-limited at low flows, and velocity-limited at high flows.

Options exist to improve fish passage conditions and expand the passage flow window by either replacing or retrofitting the culvert. Given the small size and confined nature of the stream channel, relatively thin fill below the road surface above the stream, and potential use of the road by heavy loads, a reinforced concrete box culvert is considered the better option.

Note: A separate restoration project is under consideration downstream, where the Nez Perce Tribe is in the process of soliciting interest of the two downstream landowners in placing large wood and scalping or breaching the berms that run along both sides of the channel to increase roughness and restore floodplain connectivity of Tumalum Creek. This fish passage project is effectively disconnected from the floodplain connectivity project.
WE Agreement Type:
Contracted
Deliverable Specification:
Remove and replace highway culvert; restore fish passage at the culvert that meets state and federal passage criteria.

Habitat boulders will be placed randomly within the culvert to increase roughness and prevent a hydraulic jump from forming during high flows. Logs with rootwads will be installed interlocked with existing trees downstream of the culvert to provide holding habitat and reduce velocities upstream in the culvert to support step stability. Columbia County roadway safety design requirements will be included as part of the project, including installing a guard rail which will block access to a gate on private land.
WSE Effective Budget:
$0
% of Total WSE Effective Budget:
0.00%
WSE Start:
04/01/2022
WSE End:
12/31/2023
WSE Completion:
WSE Progress:
Canceled
WSE ID Continued From:
[Unassigned]
WSE ID Continued To:
[Unassigned]
Finite or Recurring:
Finite

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Budget History

SOWRevision Planned Updated Contractor Comments (optional) BPA Comments (optional)
1. 74017 REL 100 (04/01/2022 - 12/31/2024) $154,500 $0
Work Element Budget (Current Performance Period) $0 $0

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Milestones

5 Milestones
Sort Type Title Start End Status Modified By Modified Date
A EC Environmental compliance requirements complete 4/1/2022 7/1/2022 Canceled Jennifer Lord 6/7/2023 1:35:56 PM
Description: On-the-ground work associated with this work element cannot proceed until this milestone is complete. Milestone is complete when final documentation is received from BPA environmental compliance staff.
B Complete culvert installation to restore functional fish passage 7/1/2022 12/31/2023 Canceled Jennifer Lord 6/7/2023 1:35:56 PM
Description: Implement the design to install a precast four-sided box culvert (rated to withstand traffic load criteria) to re-establish effective fish passage and restore channel function that expands available upstream spawning and rearing habitat for salmon and steelhead, and functional downstream migration. Provide construction oversight throughout the implementation period.
C Install roughened riffle(s) for structure and grade control 7/15/2022 12/31/2023 Canceled Jennifer Lord 6/7/2023 1:35:56 PM
Description: Implement the design to construct the engineered riffle(s) and/or install other large-scale roughness features within the Project Area reach. Provide construction oversight throughout the implementation period.
D Install streambed mix 9/30/2022 12/31/2023 Canceled Jennifer Lord 6/7/2023 1:35:56 PM
Description: Implement the channel design through the culvert reach, and treat with an approximately 2.8 percent sloped streambed material gradation to promote natural sediment transport through the project reach. Provide construction oversight throughout the implementation period.
E DELIV Restored Fish Passage to upstream habitat in Tumalum Creek 12/31/2023 Canceled Jennifer Lord 6/7/2023 1:35:56 PM
Description: Remove and replace highway culvert; restore fish passage at the culvert that meets state and federal passage criteria. Habitat boulders will be placed randomly within the culvert to increase roughness and prevent a hydraulic jump from forming during high flows. Logs with rootwads will be installed interlocked with existing trees downstream of the culvert to provide holding habitat and reduce velocities upstream in the culvert to support step stability. Columbia County roadway safety design requirements will be included as part of the project, including installing a guard rail which will block access to a gate on private land.

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Metrics

Implementation Metrics
Metric Planned Actual Contractor Comments Measures HLIs
1441. # of miles of habitat accessed to the next upstream barrier(s) or likely limit of habitable range 7.80 This length is based on the fish extant supported regionally by RTT miles of habitat accessed Passage Barriers
1709. # of culverts installed in the freshwater non-tidal zone 1 barriers improved

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Location

Work Site ID Latitude Longitude State County Province Subbasin
108037 46.358776 -117.685289 Washington Columbia Columbia Plateau Tucannon

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Focal Species

Primary Focal Species:
Chinook (O. tshawytscha) - Snake River Spring/Summer ESU (Threatened); Steelhead (O. mykiss) - Snake River DPS (Threatened)
Secondary Focal Species:
Lamprey, Pacific (Entosphenus tridentata); Trout, Bull (S. confluentus) (Threatened)

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Environmental Compliance

None
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RM&E Metadata

This work element does not require RM&E metadata
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