Lake Irwin
Lake Irwin in Gunnison County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 46 acres.
- Area
- 46 acres
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Why Lake Irwin 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 Irwin, 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 CDPHE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Irwin is a 46-acre lake in Gunnison County, Colorado.
Source: EPA Water Quality Portal sampling records, CDPHE, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Lake Irwin 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 Irwin
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 Irwin
Compare lakeside cabins, hotels, and vacation rentals near Lake Irwin in Gunnison County, Colorado — 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 Irwin
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 46 acres |
No bathymetric survey has been published for Lake Irwin, so its depth is not documented here.
Fishing Lake Irwin
Nearby Lakes in Gunnison County
Frequently asked questions about Lake Irwin
Where is Lake Irwin?
- Lake Irwin is a lake in Gunnison County, Colorado. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Lake Irwin?
- Lake Irwin in Gunnison County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 46 acres.
Is Lake Irwin safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Lake Irwin is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Lake Irwin across LakeQuality
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Where this data comes from
Measurements for Lake Irwin come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.