Fish and Aquatic Life
Plymouth Millpond is a moderate sized flowage within the City Limits of Plymouth on the Mullet River. The impoundment was drawn down and chemically treated in the fall of 1966, to remove the overabundant carp population in preparation of establishing a game fishery. A continued carp problem is anticipated. After treatment, the pond was stocked with largemouth bass, northern pike and crappie. Public access is available by several city streets, navigable water from the upper end of the pond, approximately two acres of city property at the dam site, and by approximately 1,000 feet of shoreline on city school property. The area has high recreational value due to accessibility and the available fishery resource.
Source: 1968, Surface Water Resources of Sheboygan County Plymouth Millpond T15N, R21E, Section 22 Surface Acres = 36, S.D.F. = 2.77, Maximum Depth = 6 feet
Author Aquatic Biologist
Plymouth Millpond is a moderately sized impoundment within the city of Plymouth on the Mullet River. The impoundment is very shallow with a soft mud bottom and very little rooted aquatic plant life. Periphytic blue-green algae are a problem as is high turbidity during months when carp activity is high. Carp have dominated the fish community and carp numbers are currently very high (pers. comm. John Nelson).
Up to 1,000 Canada Geese roost on the pond causing some nuisances to riparian landowners and providing some hunting opportunities during feeding flights. Several broods of geese are produced on the pond each year (pers. comm. Steve Klock).
Public access is available by several city streets, navigable water from the upper end of the pond, approximately two acres of city property at the dam site, and by approximately 1,000 feet of shoreline on city school property.
A sediment quality assessment was conducted by WDNR on June 29, 1999 on the Plymouth Impoundment, Mullet River. Samples were collected at two sample sites in the soft sediment that has accumulated behind the dam. The first site was 15m upstream from the dam and consisted of two cores. The top half from each core were composited for a single sample and the bottom of each core were composited for a second sample. This enables us to look at sediment quality that represents different time periods. Obviously the sediment that is buried to the greatest depth represents deposition that would have settled at an earlier date. A third sample was collected 100m upstream in the mid-channel of the impoundment. Two cores were collected and composited to make a single sample.
Author Aquatic Biologist
Wisconsin has over 84,000 miles of streams, 15,000 lakes and milllions of acres of wetlands. Assessing the condition of this vast amount of water is challenging. The state's water monitoring program uses a media-based, cross-program approach to analyze water condition. An updated monitoring strategy (2015-2020) is now available. Compliance with Clean Water Act fishable, swimmable standards are located in the Executive Summary of Water Condition in 2018. See also the 'monitoring and projects' tab.
Dam Safety or Removal
Work with the owners of the Plymouth Mill Pond dam to consider removing the dam, or if it must remain, encourage fish passage restoration, secure funding and implement projects.
Lake Management Plan Implementation
A Plymouth mill pond committee was formed and the City obtained a DNR grant to study options to improve the impoundment. Continue to work with the City on management of the Plymouth mill pond.
Dam Safety or Removal
The Department should continue to work with the City of Plymouth to address safety and water quality issues associated with the Plymouth Millpond and its dam.
Wisconsin's Water Quality Standards provide qualitative and quantitative goals for waters that are protective of Fishable, Swimmable conditions [Learn more]. Waters that do not meet water quality standards are considered impaired and restoration actions are planned and carried out until the water is once again fishable and swimmable
Management goals can include creation or implementation of a Total Maximum Daily Load analysis, a Nine Key Element Plan, or other restoration work, education and outreach and more. If specific recommendations exist for this water, they will be displayed below online.
Monitoring the condition of a river, stream, or lake includes gathering physical, chemical, biological, and habitat data. Comprehensive studies often gather all these parameters in great detail, while lighter assessment events will involve sampling physical, chemical and biological data such as macroinvertebrates. Aquatic macroinvertebrates and fish communities integrate watershed or catchment condition, providing great insight into overall ecosystem health. Chemical and habitat parameters tell researchers more about human induced problems including contaminated runoff, point source dischargers, or habitat issues that foster or limit the potential of aquatic communities to thrive in a given area. Wisconsin's Water Monitoring Strategy was recenty updated.
Grants and Management Projects
|WBIC||Official Waterbody Name||Station ID||Station Name||Earliest Fieldwork Date||Latest Fieldwork Date||View Station||View Data|
|54600||Mill Pond||10005804||Plymouth Mill Pond||9/8/2000||8/30/2017||Map||Data|
|54600||Mill Pond||604002||Plymouth Millpond - Plymouth Millpond||8/6/1979||8/6/1979||Map||Data|
Mill Pond is located in the Mullet River watershed which is 88.19 mi². Land use in the watershed is primarily agricultural (38.90%), forest (21.40%) and a mix of grassland (17.90%) and other uses (21.80%). This watershed has 97.54 stream miles, 789.87 lake acres and 6,609.38 wetland acres.
Nonpoint Source Characteristics
This watershed is ranked High for runoff impacts on streams, Not Ranked for runoff impacts on lakes and High for runoff impacts on groundwater and therefore has an overall rank of High. This value can be used in ranking the watershed or individual waterbodies for grant funding under state and county programs.However, all waters are affected by diffuse pollutant sources regardless of initial water quality. Applications for specific runoff projects under state or county grant programs may be pursued. For more information, go to surface water program grants.