Union Lake
Union Lake in Douglas County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 104 acres.
- Area
- 104 acres
- Public access
- Yes
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Why Union 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 Union Lake, 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 MPCA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Union Lake is a 104-acre lake in Douglas County, Minnesota. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Union Lake 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 Union Lake
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 Union Lake
Compare lakeside cabins, hotels, and vacation rentals near Union Lake in Douglas County, Minnesota — 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 Union Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 104 acres |
| Public Access | Yes |
No bathymetric survey has been published for Union Lake, so its depth is not documented here.
Recreation & Access
- Union LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Union Lake
Nearby Lakes in Douglas County
Frequently asked questions about Union Lake
Where is Union Lake?
- Union Lake is a lake in Douglas County, Minnesota. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Union Lake?
- Union Lake in Douglas County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 104 acres.
Is Union Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Union Lake 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 Union Lake?
- Union Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Union Lake. Public access is listed as yes.
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Where this data comes from
Measurements for Union Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory