Long Trade Lake, Trade River Watershed (SC10)
Long Trade Lake, Trade River Watershed (SC10)
Long Trade Lake (2640500)
150.49 Acres
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 Natural Communities.
Year Last Monitored
This is the most recent date of monitoring data stored in SWIMS. Additional surveys for fish and habitat may be available subsequent to this date.
This is impaired
Excess Algal Growth
Total Phosphorus, Unknown Pollutant
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.
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.
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.

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.
Shallow Lowland
Shallow lowland lake describes the depth and location of the lake in a watershed. These variables affect the lakes response to watershed variables.
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.
Aquatic Life
Waters that support fish and aquatic life communities (healthy biological communities).
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.
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.


Long Trade Lake T36N, R18W, Sec. 4, 9 Surface Acres = 151.2, S.D.F.=2.44, Maximum Depth = 11 ft., M.P.A. = 67 A flowage with a navigable inlet and a navigable outlet (22.5 cfs), the Trade River. Fish species present include northern pike, walleyes, largemouth bass and pan fish. Carp are also present but not in problem numbers. It has a .1-acre town park, and a 60 -foot town access road, but is without a parking area. There is one improved private access located at the north end of the flowage. A fee is charged for its use. This flowage has one resort and six cottages on it at present. Muskrats are present. Mallards and bluewing teal nest in its predominantly marsh wetlands. The flowage is maintained by an eleven-foot dam. Apotential pollution problem exists here in that the Atlas Cooperative Creamery has a septic tank with a tiled outlet to the lake where the overflow effluent drains.


Author   Aquatic Biologist

Historical Description

These four lakes are situated on the Trade River. They have been united under a common
lake association for many years. The Round - Trade Lake Improvement Association (including
Spirit & Long Trade Lakes) has been an active and enthusiastic leader in the pioneering efforts
at lake management in Wisconsin. The four lakes along the Trade River have exhibited signs of
excess fertility for decades. A history of chemical treatment efforts is noted in the files for
Long Trade (Atlas), Round and the Trade Lakes (Big & Little).

The signs of eutrophication are evident on these waters but a definitive nutrient and hydraulic
budget has not been documented. A feasibility study to evaluate the hydraulic and nutrient
loading to the lakes as well as in-lake monitoring to determine recycling and profile
characteristics is a high priority for these lakes. A lakes planning grant or possibly a Clean
Lakes grant study is a possibility.

WRM district staff have been working with this lake group to start the process towards a long
range lake management plan. Self-help volunteers are in place on all four lakes and Round
Lake was one of the original "expanded" monitoring group.

Date  1992

Author   Surface Water Inventory Of Wisconsin

Long Trade Lake, Trade River Watershed (SC10) Fish and Aquatic LifeLong Trade Lake, Trade River Watershed (SC10) RecreationLong Trade Lake, Trade River Watershed (SC10) Fish Consumption

Impaired Waters

Long Trade Lake (WBIC 2640500) was placed on the impaired waters list for total phosphorus in 2012 and for eutrophication caused by an unknown pollutant in 2014. The 2018 assessments showed continued impairment by phosphorus; new total phosphorus and chlorophyll-a sample data overwhelmingly exceeded the 2018 WisCALM listing thresholds for the Recreation use and Fish and Aquatic Life use. Chloride data did not exceed use thresholds. This water was not meeting its designated uses and was considered impaired. No listing change was needed to the existing impaired waters listing.

Date  2017

Author  Ashley Beranek

Impaired Waters

Long Trade Lake (2640500) was placed on the impaired waters list for total phosphorus in 2012 and for eutrophication caused by an unknown pollutant in 2014. The 2016 assessments showed continued impairment by phosphorus and eutrophication caused by an unknown pollutant; total phosphorus sample data overwhelmingly exceeded 2016 WisCALM listing thresholds for the Recreation use, but not Fish and Aquatic Life use, and chlorophyll data exceeded both REC and FAL thresholds. Based on the most updated information, no change in existing impaired waters listing is needed.

Date  2015

Author  Aaron Larson


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.


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 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

Monitoring Projects

Watershed Characteristics

Long Trade Lake is located in the Trade River watershed which is 194.93 miĀ². Land use in the watershed is primarily forest (56.40%), wetland (18.80%) and a mix of grassland (11.70%) and other uses (13.10%). This watershed has 166.68 stream miles, 2,902.48 lake acres and 21,757.05 wetland acres.

Nonpoint Source Characteristics

This watershed is ranked Medium for runoff impacts on streams, Not Ranked for runoff impacts on lakes and Low for runoff impacts on groundwater and therefore has an overall rank of Low. This value can be used in ranking the watershed or individual waterbodies for grant funding under state and county programs.This water is ranked High Lake for individual Unknowns based on runoff problems and the likelihood of success from project implementation.

Natural Community

Long Trade Lake is considered a Reservoir under the state's Natural Community Determinations.

Natural communities (stream and lake natural communities) represent model results and DNR staff valiation processes that confirm or update predicted conditions based on flow and temperature modeling from historic and current landscape features and related variables. Predicated flow and temperatures for waters are associated predicated fish assemblages (communities). Biologists evaluate the model results against current survey data to determine if the modeled results are corect and whether biological indicators show water quaity degradation. This analysis is a core component of the state's resource management framework. Wisconsin's Riverine Natural Communities.