Moose Lake
Moose Lake in Waukesha County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 16 ft visibility.
- Clarity
- 16 ft
- Max depth
- ~42 ft est.
- Trend
- ↑ Improving
- Public access
- Yes
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Why Moose Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Moose Lake, the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity. Sampling here has recorded water clarity, but not phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Moose Lake is a lake in Waukesha County, Wisconsin with an estimated average depth of about 42 feet. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-09-01. Grade methodology: LakeQuality methodology.
Watch Moose Lake water quality
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Moose Lake
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 16 ft down. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 16 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Moose Lake
Compare lakeside cabins, hotels, and vacation rentals near Moose Lake in Waukesha 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 Moose Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~42 ft est. |
| Average Depth | ~11 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Wisconsin has not published bathymetry for Moose Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Moose LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Moose Lake
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.621 m/yr | 6 |
| Phosphorus | ↑ Improving | -0.55 µg/L/yr | 3 |
| Chlorophyll-a | ↑ Improving | -0.1 µg/L/yr | 2 |
EPA Impairment Status
Moose Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5R).
Causes of impairment
Source: EPA ATTAINS assessment unit WI10009840 · Official waterbody report · Matched by proximity (2.36 km)
Graded lakes near Moose Lake
Moose Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Waukesha County
Frequently asked questions about Moose Lake
Where is Moose Lake?
- Moose Lake is a lake in Waukesha County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — there is not enough recent sampling to assign a letter.
What is the water quality grade for Moose Lake?
- Moose Lake in Waukesha County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 16 ft visibility.
Is Moose Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Moose Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
How deep is Moose Lake?
- No published bathymetric survey covers Moose Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 42 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Moose Lake?
- Moose Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Moose Lake. Public access is listed as yes.
Explore Moose Lake across LakeQuality
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Where this data comes from
39 measurements from 2 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Wisconsin Department of Natural Resources
WIDNR_WQX39 samples · 2020–2025
Monitoring station identifiers (2)
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)
Named boat-access points from the USGS National Boat Ramps inventory