Mukwonago River, Mukwonago River Watershed (FX06)
Mukwonago River, Mukwonago River Watershed (FX06)
Mukwonago River (765500)
7.16 Miles
4.14 - 11.29
Natural Community
Natural communities (stream and lake natural communities) represent model results that use predicted flow and temperature based on landscape features and related assumptions. Ranges of flow and temperature associated with specific aquatic life communities (fish, macroinvertebrates) help biologists identify appropriate resource management goals. Wisconsin's Riverine Natural Communities.
Warm Mainstem, COOL-Warm Mainstem
Year Last Monitored
This date represents the most recent date of water quality monitoring stored in the SWIMS system. Additional field surveys for fish and habitat may be available subsequent to this date.
2017
Good
 
Waukesha
Trout Water 
Trout Waters are represented by Class I, Class II or Class III waters. These classes have specific ecological characteristics and management actions associated with them. For more information regarding Trout Classifications, see the Fisheries Trout Class Webpages.
Yes
Outstanding or Exceptional 
Wisconsin has designated many of the state's highest quality waters as Outstanding Resource Waters (ORWs) or Exceptional Resource Waters (ERWs). Waters designated as ORW or ERW are surface waters which provide outstanding recreational opportunities, support valuable fisheries and wildlife habitat, have good water quality, and are not significantly impacted by human activities. ORW and ERW status identifies waters that the State of Wisconsin has determined warrant additional protection from the effects of pollution. These designations are intended to meet federal Clean Water Act obligations requiring Wisconsin to adopt an 'antidegradation' policy that is designed to prevent any lowering of water quality - especially in those waters having significant ecological or cultural value.
Yes
Impaired Water 
A water is polluted or 'impaired' if it does not support full use by humans, wildlife, fish and other aquatic life and it is shown that one or more of the pollutant criteria are not met.
No

Fish and Aquatic Life

Current Use
The use the water currently supports. This is not a designation or classification; it is based on the current condition of the water. Information in this column is not designed for, and should not be used for, regulatory purposes.
Cold (Class II Trout)
Streams supporting a cold water sport fishery, or serving as a spawning area for salmonids and other cold water fish species. Representative aquatic life communities, associated with these waters, generally require cold temperatures and concentrations of dissolved oxygen that remain above 6 mg/L through natural reproduction and selective propagation. Since these waters are capable of supporting natural reproduction, a minimum dissolved oxygen concentration of 7 mg/L is required during times of active spawning and support of early life stages of newly-hatched fish.
Attainable Use
The use that the investigator believes the water could achieve through managing "controllable" sources. Beaver dams, hydroelectric dams, low gradient streams, and naturally occurring low flows are generally not considered controllable. The attainable use may be the same as the current use or it may be higher.
Cold (Class II Trout)
Streams supporting a cold water sport fishery, or serving as a spawning area for salmonids and other cold water fish species. Representative aquatic life communities, associated with these waters, generally require cold temperatures and concentrations of dissolved oxygen that remain above 6 mg/L through natural reproduction and selective propagation. Since these waters are capable of supporting natural reproduction, a minimum dissolved oxygen concentration of 7 mg/L is required during times of active spawning and support of early life stages of newly-hatched fish.
Designated Use
This is the water classification legally recognized by NR102 and NR104, Wis. Adm. Code. The classification determines water quality criteria and effluent limits. Waters obtain designated uses through classification procedures.
Cold
Streams capable of supporting a cold water sport fishery, or serving as a spawning area for salmonids and other cold water fish species. Representative aquatic life communities, associated with these waters, generally require cold temperatures and concentrations of dissolved oxygen that remain above 6 mg/L. Since these waters are capable of supporting natural reproduction, a minimum dissolved oxygen concentration of 7 mg/L is required during times of active spawning and support of early life stages of newly-hatched fish.

Overview

The Mukwonago River is a 16.8-mile-long river in Walworth and Waukesha Counties. Mile 4.08 through 9.68 (from the mouth) is classified as a Class II trout water. Mile 9.68 through 9.76 of Mukwonago River is classified as a Class III trout water, and Mile 11.97 through 15.47 of the river is a Class I trout water.

Date  2012

Author   Aquatic Biologist

Mukwonago River, Mukwonago River Watershed (FX06) Fish and Aquatic LifeMukwonago River, Mukwonago River Watershed (FX06) RecreationMukwonago River, Mukwonago River Watershed (FX06) Fish Consumption

General Condition

The Mukwonago River (Lower Phantom Lake to Jericho Creek) was assessed during the 2018 listing cycle; total phosphorus data clearly met the 2018 WisCALM listing thresholds for the Fish and Aquatic Life use. Temperature and available biological data did not indicate impairment (i.e. no macroinvertebrate or fish Index of Biotic Integrity (IBI) scored in the "poor" condition category). This water was meeting this designated use and was not considered impaired.

Date  2017

Author  Amanda Smith

General Condition

Mukwonago River was assessed during the 2018 listing cycle; new chloride and new biological (macroinvertebrate and fish Index of Biotic Integrity (IBI) scores) sample data were clearly below the 2018 WisCALM listing thresholds for the Fish and Aquatic Life use. This water was meeting this designated use and was not considered impaired.

Date  2017

Author  Ashley Beranek

Condition

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 2016 . See also 'monitoring' and 'projects'.

Reports

Recommendations

Monitor Water Quality or Sediment
Conduct water quality sampling on the Mukwonago River
Information and Education
Nature Conservancy interns in canoes will also intercept boaters utilizing the channel between Lulu and Eagle Springs and speak about reversing their motors to prevent the spread of exotic species
Control Invasive Species
Worked to control Phragmites, purple loosestrife, reed canary grass, buckthorn, Eurasian water milfoil and narrow leafed cattail. Control methods include hand pulling, hand cutting, backpack chemical treatment and beetle rearing/dispersal.
Monitor Water Quality or Sediment
More data collect, continuous monitoring, biology not showing impairment. AU: 897059; ID: 10029281
Nutrient Budget Development
Data Analysis or Evaluation
Evaluated data and literature regarding potential impacts of swimming on the water quality of lakes
Water Quality Planning
Mukwonago
Protect Riparian or Shorelands
Plan developments with consideration for protection and / or enhancement of natural resources and habitat areas that define the unique character of the Mukwonago River Watershed.
Information and Education
Coordinate outreach efforts to improve awareness of the valuable resources in the Mukwonago River Watershed.
Stormwater Planning, Implementation
Consider the many unique and threatened / endangered resources in the Mukwonago River Watershed when planning and implementing stormwater controls.
Stormwater Planning, Implementation
Coordinate planning and implementation of construction and long-term stormwater management controls in the Mukwonago River Watershed among local, county and state authorities, including state transportation projects.
Water Quality Planning
Aquatic resources, including fish and aquatic plants, in the Mukwonago River Watershed should be monitored and managed in consideration of existing and revised plans. Evaluation of the plans over time should be done to review and revise the success of the activities and available resources.

Management Goals

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 and implementation of a Total Maximum Daily Load Analysis, habitat restoration work, partnership education and outreach and more. If specific recommendations exist for this water, they will be displayed below.

Monitoring

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

Monitoring Projects

Watershed Characteristics

Mukwonago River is located in the Mukwonago River watershed which is 86.21 miĀ². Land use in the watershed is primarily agricultural (44%), forest (22%) and a mix of suburban (16%) and other uses (17%). This watershed has 63.38 stream miles, 2,340.41 lake acres and 4,822.44 wetland acres.

Nonpoint Source Characteristics

This watershed is ranked Medium for runoff impacts on streams, High 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.

Natural Community

Mukwonago River is considered a Warm Mainstem, COOL-Warm Mainstem under the state's Natural Community Determinations.

Natural communities (stream and lake natural communities) represent model results that use predicted flow and temperature based on landscape features and related assumptions. Ranges of flow and temperature associated with specific aquatic life communities (fish, macroinvertebrates) help biologists identify appropriate resource management goals. Wisconsin's Riverine Natural Communities.

Warm Mainstem waters are moderate-to-large but still wadeable perennial streams with relatively warm summer temperatures. Coldwater fishes are absent, transitional fishes are common to uncommon, and warm water fishes are abundant to common. Headwater species are common to absent, mainstem species are abundant to common, and river species are common to absent.