Cruson Slough Lake
Cruson Slough Lake in Richland County, Wisconsin has a water quality grade of C (Fair). Water clarity: 7.6 ft visibility. Phosphorus: 28.9 µg/L. Surface area: 80 acres.
- Clarity
- 7.6 ft
- Typical in August
- 69°F
- Area
- 80 acres
- Type
- Eutrophic
- Public access
- Yes
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Cruson Slough Lake is a 80-acre productive, nutrient-rich eutrophic lake in Richland County, Wisconsin. Water quality is graded C based on 1 sampling years through 2025. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 1 other monitored lakes in Richland County, Cruson Slough Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-10-31. Grade methodology: LakeQuality methodology.
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Swimming Safety
Grade onlyLimited data
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)
Moderate clarity, visible to about 7.6 ft. Phosphorus level: 28.9 µg/L. Trophic State Index: 50.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.6 ft | Not graded |
| Phosphorus | 28.9 µg/L | Fair |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 50 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Cruson Slough Lake
Compare lakeside cabins, hotels, and vacation rentals near Cruson Slough Lake in Richland 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.
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Water Temperature
Cruson Slough Lake typically sits around 69°F at the surface in August. Summer average is about 78°F. Usually warmest in Jun (about 83°F) and coldest in Oct (about 47°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 19 field readings (2025–2025) via the EPA Water Quality Portal. See the full Cruson Slough Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 80 acres |
| Public Access | Yes |
No bathymetric survey has been published for Cruson Slough Lake, so its depth is not documented here.
Recreation & Access
- Lone Rock Unit #1Public
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Cruson Slough Lake
Reservoir Info (USACE NID)
Cruson Slough Lake is a man-made reservoir impounded by the Cruson Slough, built primarily for recreation on the TR-WISCONSIN RIVER; earth-type dam, 7 ft tall and 300 ft long.
- Surface area
- 80 ac
- Normal storage
- 100 ac-ft
- Max storage
- 260 ac-ft
- Drainage area
- 0.3 sq mi
- Hazard class
- Low
- Owner
- Wisconsin Department of Natural Resources
Source: USACE National Inventory of Dams, NID ID WI01121 · Operator website
County Ranking
Ranked #1 of 2 lakes in Richland County
Nearby Lakes With Higher Grades
Cruson Slough Lake holds Grade C. 2 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Richland County
Frequently asked questions about Cruson Slough Lake
Where is Cruson Slough Lake?
- Cruson Slough Lake is a lake in Richland County, Wisconsin. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Cruson Slough Lake?
- Cruson Slough Lake in Richland County, Wisconsin has a water quality grade of C (Fair). Water clarity: 7.6 ft visibility. Phosphorus: 28.9 µg/L. Surface area: 80 acres.
Is Cruson Slough Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Cruson Slough Lake has a water quality grade of C (Fair). Always check local health department advisories before swimming.
What is the water temperature of Cruson Slough Lake?
- Cruson Slough Lake typically sits around 69°F at the surface in August, from 19 EPA Water Quality Portal field readings (2025–2025). That is a typical value for the month, not a live reading.
Are there boat ramps on Cruson Slough Lake?
- Cruson Slough Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Lone Rock Unit #1. Public access is listed as yes.
Explore Cruson Slough Lake across LakeQuality
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High nutrients, frequent algae, reduced clarity
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Where this data comes from
12 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX12 samples · 2025
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
Named boat-access points from the USGS National Boat Ramps inventory