Lake Onalaska
Lake Onalaska in La Crosse County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 10520 acres.
- Area
- 10,520 acres
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Why Lake Onalaska 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 Lake Onalaska, no water-quality sampling on record for this lake.
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.
Lake Onalaska is a 10,520-acre lake in La Crosse County, Wisconsin.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Lake Onalaska water quality
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Lake Onalaska
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Lake Onalaska
Compare lakeside cabins, hotels, and vacation rentals near Lake Onalaska in La Crosse 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 Onalaska
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DNR Reports & Resources
Wisconsin DNR Fisheries scientists publish multi-year survey reports for Lake Onalaska covering fish populations, stocking, water quality, and management. 2 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- 2020Mississippi River, Lake Onalaska gamefish assessment, 2020Fisheries Survey · WI DNR · 2020 (PDF)
- 2015An Evaluation of Fishery Trends at the Lake Onalaska Habitat Project, 2015Fisheries Survey · WI DNR · 2015 (PDF)
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 10,520 acres |
No bathymetric survey has been published for Lake Onalaska, so its depth is not documented here.
Recreation & Access
- Fred FunkPublic
- North Shore LanePublic
- DakotaPublic
- DresbachPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Onalaska
Nearby Lakes in La Crosse County
Frequently asked questions about Lake Onalaska
Where is Lake Onalaska?
- Lake Onalaska is a lake in La Crosse County, Wisconsin. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Lake Onalaska?
- Lake Onalaska in La Crosse County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 10520 acres.
Is Lake Onalaska safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Onalaska is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Lake Onalaska?
- Lake Onalaska has 4 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Fred Funk, North Shore Lane, Dakota, Dresbach.
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Where this data comes from
Measurements for Lake Onalaska come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory