Project Need
Need For Project:
Parowan Pond is a popular community fishery in the small town of Parowan, UT, but it is currently limited by a recent influx of sediment that has reduced the volume of the pond and quality of the fishery. The current state is the result of a poor inflow structure that did not limit or bypass high sediment loads from entering the pond, an issue that was made even worse by the flashy flood events following the Brian Head Fire. The sediment needs to be dredged/removed to regain the full water storage potential of the pond and, subsequently, the full capacity of the fishery. The inflow structure has recently been updated to reduce the sediment supply and minimize future maintenance needs.
Objectives:
This project has two main goals with corresponding objectives:
Goal 1 - Regain the full capacity of the pond that has been lost in recent years through sediment deposition.
Objective - Dredge and remove at least 100 cubic yards of material from around the entire pond.
Goal 2 - Minimize future sediment deposition in the pond.
Objective - A new inflow structure has been installed that is able to bypass high flow events carrying large amounts of sediment (e.g., extreme monsoon storm).
Project Location/Timing Justification (Why Here? Why Now?):
There is not a typical threat to the ecological importance of Parowan Pond because it is an artificial water, small in size, and located in an relatively urban setting that is largely unconnected from surrounding habitat and wildlife. However, the fishery in Parowan Pond is important to the angling public and if the capacity is not regained and the pond continues to fill with sediment, the fishery will continue to diminish and may become unable to support a fishery at all. The lower volume of water reduces the total biomass of fish that can be supported and exacerbates habitat issues, especially as related to temperature and oxygen.
Relation To Management Plan:
The project meets general Utah Division of Wildlife Resources (UDWR) Goals and Objectives to increase fish populations and expand quality fishing opportunities.
Fire / Fuels:
Not applicable.
Water Quality/Quantity:
The project could help to dampen high temperatures, increase oxygen, and reduce nutrient loading that would lead to eutrophication.
Compliance:
Parowan City will ensure any necessary permits/approval/etc. are secured.
Methods:
The UDWR will rent a special "long reach" excavator and Parowan City will provide a standard excavator, loaders, dump trucks needed to dredge the pond and install the new inflow structure (Parowan City will also purchase the new inflow structure materials). Parowan City employees will operate the equipment and do the on-the-ground work, likely in the fall of 2021.
Monitoring:
Periodic site visits will be made to ensure the pond and fishery are functioning. Parowan City will operate and maintain the new inflow structure.
Partners:
Parowan City
Future Management:
The new inflow structure should minimize the future maintenance that is needed (e.g., additional dredging should be needed in decades, not just a few years).
Sustainable Uses of Natural Resources:
Not applicable. The fishery at Parowan Pond is essentially maintained through stocking.