Monument Lake
Monument Lake in Sweetwater County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 295 acres.
- Area
- 295 acres
Next lake in Sweetwater County
Swipe left or right on this bar to open the next or previous lake.
Why Monument 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 Monument 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 Wyoming DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Monument Lake is a 295-acre lake in Sweetwater County, Wyoming.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Monument Lake water quality
Subscribe for LakeQuality updates by email. No spam, unsubscribe anytime.
Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Monument 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 Monument Lake
Compare lakeside cabins, hotels, and vacation rentals near Monument Lake in Sweetwater County, Wyoming — 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 Monument Lake
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Wyoming’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 295 acres |
No bathymetric survey has been published for Monument Lake, so its depth is not documented here.
Fishing Monument Lake
Nearby Lakes in Sweetwater County
Frequently asked questions about Monument Lake
Where is Monument Lake?
- Monument Lake is a lake in Sweetwater County, Wyoming. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Monument Lake?
- Monument Lake in Sweetwater County, Wyoming is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 295 acres.
Is Monument Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Monument Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Monument Lake across LakeQuality
More Wyoming Lake Rankings
Other Lakes in Wyoming
Where this data comes from
Measurements for Monument Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.