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Monitoring sediment flushing flows on the Weber River in Morgan Valley
Region: Northern
ID: 6752
Project Status: Completed
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Project Details
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Need for Project
The purpose of the flushing flow release from Echo Dam, as stated by the Utah Division of Wildlife Resources (UDWR), is to remove fine sediment (i.e., sediment <2mm in diameter) from the bed of the Weber River in a reach extending from the intake of the Stoddard Diverson to the USGS gage on the Weber River at Gateway, UT (USGS gage 10136500), a length of ~10 miles. A secondary objective, also articulated by UDWR, is to remove vegetation from the river bed.
Provide evidence about the nature of the problem and the need to address it. Identify the significance of the problem using a variety of data sources. For example, if a habitat restoration project is being proposed to benefit greater sage-grouse, describe the existing plant community characteristics that limit habitat value for greater sage-grouse and identify the changes needed for habitat improvement.
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Objectives
In collaboration with UDWR and Trout Unlimited, we will conduct monitoring before, during, and after the flushing flow event. The purpose of the monitoring is to determine whether the flushing flow met the management objectives and to develop a long-term monitoring protocol for future flushing flows. The monitoring protocol described here will address the following questions. a) How much fine sediment and vegetation was removed from the channel bed? b) How long after the flushing flow does it take for fine sediment and vegetation to reestablish?
Provide an overall goal for the project and then provide clear, specific and measurable objectives (outcomes) to be accomplished by the proposed actions. If possible, tie to one or more of the public benefits UWRI is providing.
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Project Location/Timing Justification (Why Here? Why Now?)
Currently, the past few years of drought have not provided any runoff flows to remove the fine sediments, gravel, and cobbles. Additionally, the macrophyte vegetation growth is increasing each year. If this flush does not occur, would continue to impact the fishery in this reach with high water temperatures and low oxygen levels.
LOCATION: Justify the proposed location of this project over other areas, include publicly scrutinized planning/recovery documents that list this area as a priority, remote sensing modeling that show this area is a good candidate for restoration, wildlife migration information and other data that help justify this project's location.
TIMING: Justify why this project should be implemented at this time. For example, Is the project area at risk of crossing an ecological or other threshold wherein future restoration would become more difficult, cost prohibitive, or even impossible.
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Relation to Management Plans
Bonneville cutthroat trout Conservation Agreement and Strategy; Three Species Conservation Agreement and Strategy
List management plans where this project will address an objective or strategy in the plan. Describe how the project area overlaps the objective or strategy in the plan and the relevance of the project to the successful implementation of those plans. It is best to provide this information in a list format with the description immediately following the plan objective or strategy.
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Fire/Fuels
N/A
If applicable, detail how the proposed project will significantly reduce the risk of fuel loading and/or continuity of hazardous fuels including the use of fire-wise species in re-seeding operations. Describe the value of any features being protected by reducing the risk of fire. Values may include; communities at risk, permanent infrastructure, municipal watersheds, campgrounds, critical wildlife habitat, etc. Include the size of the area where fuels are being reduced and the distance from the feature(s) at risk.
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Water Quality/Quantity
The partnership of the groups involved have agreed that this opportunity will allow us to learn what flows are needed to clean this reach of the river in times of excess water upstream during the winter. This will hopefully increase water quality in the futre.
Describe how the project has the potential to improve water quality and/or increase water quantity, both over the short and long term. Address run-off, erosion, soil infiltration, and flooding, if applicable.
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Compliance
N/A
Description of efforts, both completed and planned, to bring the proposed action into compliance with any and all cultural resource, NEPA, ESA, etc. requirements. If compliance is not required enter "not applicable" and explain why not it is not required.
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Methods
We will employ some simple methods including painting point bars with bright spray paint, collecting pebble counts, monitoring and collecting turbidity measurements during the flows, creating and maintaining photo points and possibly using a drone to monitor growth of vegetation.
Describe the actions, activities, tasks to be implemented as part of the proposed project; how these activities will be carried out, equipment to be used, when, and by whom.
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Monitoring
To answer these questions, we propose the following monitoring activities. I. Bed mobility study to determine the grain size of gravel mobilized during the flushing flow. Paint gravels of different grain sizes in 5-10 monitoring sites throughout the study reach and determine if the gravel bed moved enough to allow fines to be flushed. II. Pre- and post-surface measurements at 5-10 monitoring sites throughout the study reach before the event, directly after the event, and every 3 months for the following year. III. Pre- and post-flushing flow photography of bed vegetation at 5-10 monitoring sites throughout the study reach before the event, directly after the event, and every month for the following year during the growing season. IV. Suspended sediment concentration sampling (work contracted to USGS) OR turbidity/LISST measurements (completed by USU or Trout Unlimited) during the flushing flow event. Possible discharge measurements from Peterson Bridge if Stoddard Diversion is unmeasured. V. Analysis of in-channel vegetation removal and channel adjustment caused by the flushing flow event. Pre-event images from 2021 NAIP and post-event satellite images from Planet Labs (application for an academic license pending).
Describe plans to monitor for project success and achievement of stated objectives. Include details on type of monitoring (vegetation, wildlife, etc.), schedule, assignments and how the results of these monitoring efforts will be reported and/or uploaded to this project page. If needed, upload detailed plans in the "attachments" section.
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Partners
Utah State University Weber Basin Water Conservation District Trout Unlimited UDWR PacifiCorp Weber River water commissioner
List any and all partners (agencies, organizations, NGO's, private landowners) that support the proposal and/or have been contacted and included in the planning and design of the proposed project. Describe efforts to gather input and include these agencies, landowners, permitees, sportsman groups, researchers, etc. that may be interested/affected by the proposed project. Partners do not have to provide funding or in-kind services to a project to be listed.
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Future Management
Based on the flows and data collected, UDWR, TU, and USU will use the data for future flows and what flows are needed and for how long. With this information, UDWR and TU will coordinate with Weber Basin for additional releases if needed
Detail future methods or techniques (including administrative actions) that will be implemented to help in accomplishing the stated objectives and to insure the long term success/stability of the proposed project. This may include: post-treatment grazing rest and/or management plans/changes, wildlife herd/species management plan changes, ranch plans, conservation easements or other permanent protection plans, resource management plans, forest plans, etc.
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Sustainable Uses of Natural Resources
This flushing flow will allow better water quality and quantity in this reach during the winter season. It will maintain a quality fishery that struggles during the summer with low flows, higher water temperatures, and low oxygen levels. The vegetation may add oxygen to the water for the fishery but also slows flows and may elevate temperatures.
Potential for the proposed action to improve quality or quantity of sustainable uses such as grazing, timber harvest, biomass utilization, recreation, etc. Grazing improvements may include actions to improve forage availability and/or distribution of livestock.
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