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Overview
Basics
Basics
The purpose of the project is to protect existing force and gravity sewer mains and the Bellevue Pump Station from flooding and channel migration using an adaptive management approach and primarily vegetative techniques.
To close out the Adaptive Management Program for this project, final monitoring, including topographic, field hydrology, and vegetation surveys, were conducted in 2020 to demonstrate the changes in flow patterns resulting from the features installed to protect the District's utility easement. Findings from the final survey effort will be documented in a final AMP Technical Report to complete the regulatory reporting requirements for this project in 2021.
Completed
2013
2014
2016
$735,000
Donielle Morse (dmorse@stpud.us)
06/26/2014
01/20/2023
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| Location Information | Location Notes |
|---|---|
Organizations
Organizations
EIP Details
EIP Basics
EIP Basics
01.02.01.0047 - STPUD Upper Truckee Marsh Sewer Facilities Protection Project
Performance Measures
Expected Performance Measures
Expected Performance Measures
No expected performance measures set for this project.
Reported Performance Measures
Reported Performance Measures
| Acres of SEZ Restored or Enhanced | |||
|---|---|---|---|
| 2016 | Total | Units | |
| Action Performed | |||
| Restored | 1 | 1 | acres |
| Total | 1 | 1 | acres |
| No accomplishments to report for: | |
| Year(s) | 2014, 2015 |
|---|---|
| Explanation | performance measures reported in 2016 |
Funding
Expected Funding
Expected Funding
$735,000
$735,000
$0
| Total | |||
|---|---|---|---|
| Unknown or Unassigned | $735,000 | $735,000 | $0 |
| Grand Total | $735,000 | $735,000 | $0 |
Reported Expenditures
Reported Expenditures
| Total | 2016 | 2015 | 2014 | 2013 | |
|---|---|---|---|---|---|
| South Tahoe Public Utility District | $735,000 | $159,000 | $192,000 | $384,000 | $0 |
| Grand Total | $735,000 | $159,000 | $192,000 | $384,000 | $0 |
Photos
Main pilot channel flows entering Trout Creek, Bellevue work area.
(Timing: After) (~83 KB)
Photo of project displaying area of diverted/dewatered streamflow
(Timing: After) (~213 KB)
View east of the flood channel; Fill Hummock 1 (FH-1) and Fill Hummock 3 (FH-3) forming new channel embankment along right side of channel, Bellevue work area.
(Timing: After) (~167 KB)
Other Details
Watersheds
Threshold Categories
No Threshold Categories set for this project.
Local and Regional Plans
No Local and Regional Plans set for this project.
Related Projects
Related Projects
No Related Projects set for this project.
External Links
No external links entered.
Notes
Notes
| 01/13/2023 1:43 PM | Yesenia Pacheco | • No work under the Adaptive Management Plan has occurred since 2017. • Monitoring was discontinued after the fall of 2020. • The final Adaptive Management Closeout Report was submitted in Feb 2022, and NHC’s contract is complete. |
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| 01/06/2020 11:49 AM | Yesenia Pacheco | Update for 2019 The District is continuing to monitor hydrologic conditions and the effectiveness of approved features constructed within two designated works areas for implementation of an approved Adaptive Management Plan (AMP). The objective of the AMP is to reduce flooding of the District’s sewer easement and reduce the potential for stream channel development and erosion that would expose or damage existing sewer lines within the Upper Truckee Marsh. Post-construction monitoring for this project was conducted during low-flow periods in August 2019 and November 2019. Turbidity and groundwater elevation monitoring files were updated through August 2019. Bellevue Area - Pilot channels were found to generally be operating as expected. Fill hummocks FH-1 and FH-3 were observed forming a new channel embankment along the right-bank of the flood channel neighboring the District’s Bellevue Sewer Pump Station. The channel embankment has increased surface roughness along the north margin of the Upper Truckee Marsh, improving flood protection for the pump station and adjoining sewer lines. New wetland vegetation planted on fill hummock FH-6A, covers 40% of the hummock adding new surface roughness along the utility easement. Prolonged flooding through this area is slowing growth of vegetative cover. Hummock H-4 and left over-bank openings LBO-1, LBO-2 and LBO-3 are encouraging Trout Creek flows, away from the pump station through a pilot channel routing flows towards the interior of the marsh. Beaver activity has increased east of the Bellevue area, upstream along Trout Creek. In-stream dams are creating surface flows moving around the dam and crossing the District’s utility easement. These surface flows tend to remain in the overbank area along the District’s easement once they leave the channel rather than returning to the main channel. This is contributing to flooding of hummock FH-6A and hummocks installed around manholes upstream. Rubicon Trail Work Area – Beaver workings were observed along the secondary channel downstream (south) of its connection to Trout Creek. Recent aggradation of the main channel of Trout Creek has significantly reduced channel capacity, upstream (east) of the secondary channel causing widespread inundation of the marsh fringing the left and right banks of the main channel. Aggradation of the main channel has also caused the pond leveler installed at the head of the secondary channel in 2016 to become ineffective. |