Lake Mohawksin
Lake Mohawksin in Lincoln County, Wisconsin has a water quality grade of C (Fair). Water clarity: 4 ft visibility. Phosphorus: 34.7 µg/L. Maximum depth: 25 ft. Surface area: 1515 acres.
- Clarity
- 4 ft
- Max depth
- 25 ft
- Area
- 1,515 acres
- Type
- Eutrophic
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Lincoln County
Lake Mohawksin is a 1,515-acre productive, nutrient-rich eutrophic lake in Lincoln County, Wisconsin with a maximum depth of 25 feet. Water quality is graded C based on 1 sampling years through 2026. Overall water quality is improving over recent sampling years. The lake supports 6 documented fish species including Musky, Panfish, and Largemouth Bass. Public access is available with 5 public boat landings. Compared to the 12 other monitored lakes in Lincoln County, Lake Mohawksin ranks #10 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2026-05-02. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyModerate
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Murky, only visible to about 4 ft. Phosphorus level: 34.7 µg/L. Trophic State Index: 56.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4 ft | Not graded |
| Phosphorus | 34.7 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 56 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Lake Mohawksin
Compare lakeside cabins, hotels, and vacation rentals near Lake Mohawksin in Lincoln County, Wisconsin — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Lake Mohawksin
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Planning a trip? Cabins and lodging at Lake Mohawksin → · more Wisconsin lake trips
Blue-Green Algae (Cyanobacteria)
There’s no recent EPA CyAN cyanobacteria estimate for Lake Mohawksin — clouds, ice, or an off-season gap in coverage. The most recent reading was high (147,231 cells/mL) on May 2, 2026.
Blue-green algae can appear and clear within days, so check your state’s current advisory before swimming. EPA CyAN ↗
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 25 ft |
| Surface Area | 1,515 acres |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Bay Mill RoadPublic
- Deer Park RoadPublic
- Sara ParkPublic
- Bradley ParkPublic
- Mohawksin LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Lake Mohawksin
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 2006. 9 stations on file (most recent sample 2025).
Fish Species (DNR-rated)
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.086 m/yr | 6 |
| Phosphorus | ↑ Improving | -1.07 µg/L/yr | 6 |
EPA Impairment Status
Lake Mohawksin is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10007160 · Official waterbody report
County Ranking
Ranked #10 of 13 lakes in Lincoln County
Nearby Lakes With Higher Grades
Lake Mohawksin holds Grade C. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Lincoln County
Frequently asked questions about Lake Mohawksin
What is the water quality grade for Lake Mohawksin?
- Lake Mohawksin in Lincoln County, Wisconsin has a water quality grade of C (Fair). Water clarity: 4 ft visibility. Phosphorus: 34.7 µg/L. Maximum depth: 25 ft. Surface area: 1515 acres.
Is Lake Mohawksin safe to swim in?
- Generally safe for swimming, moderate water quality. Lake Mohawksin has a water quality grade of C (Fair). Always check local health department advisories before swimming.
How deep is Lake Mohawksin?
- Lake Mohawksin has a maximum depth of 25 feet. The lake covers 1515 acres.
What fish are in Lake Mohawksin?
- Fish species found in Lake Mohawksin include Musky, Panfish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye. Lake Mohawksin is located in Lincoln County, Wisconsin.
Does Lake Mohawksin have blue-green algae?
- There is no recent EPA CyAN cyanobacteria estimate for Lake Mohawksin (clouds, ice, or an off-season gap). The most recent reading was high (147,231 cells/mL). Blue-green algae can appear and clear within days, so check Wisconsin's current advisory before swimming.
Are there boat ramps on Lake Mohawksin?
- Lake Mohawksin has 5 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Bay Mill Road, Deer Park Road, Sara Park, Bradley Park, among others. Public access is listed as yes.
Explore Lake Mohawksin across LakeGrade
Depth, room, public access, and the state wake-sport rules
Fish species and top-graded lakes across Wisconsin
Fish species and best lakes in Lincoln County
Species activity outlook by water temperature and season
Where to stay at Wisconsin's top lakes, each with its grade
Lakes in the Wisconsin River Watershed, ranked by water quality
High nutrients, frequent algae, reduced clarity
Wisconsin's cleanest and most-polluted lakes, ranked
More Wisconsin Lake Rankings
State Parks Near Lake Mohawksin
Other Grade C Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Compare Lake Mohawksin With Nearby Lakes
Where this data comes from
47 measurements from 1 monitoring station, 2020–2026. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX47 samples · 2020–2026
Analytical methods
- Phosphorus by Colorimetry
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory