Topaz Slough
Topaz Slough in Millard County, Utah is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 30 acres.
- Area
- 30 acres
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Why Topaz Slough 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 Topaz Slough, 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 Utah DWQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Topaz Slough is a 30-acre lake in Millard County, Utah.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Topaz Slough 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 Topaz Slough
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 Topaz Slough
Compare lakeside cabins, hotels, and vacation rentals near Topaz Slough in Millard County, Utah — 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 Topaz Slough
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 30 acres |
No bathymetric survey has been published for Topaz Slough, so its depth is not documented here.
Fishing Topaz Slough
Nearby Lakes in Millard County
Frequently asked questions about Topaz Slough
Where is Topaz Slough?
- Topaz Slough is a lake in Millard County, Utah. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Topaz Slough?
- Topaz Slough in Millard County, Utah is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 30 acres.
Is Topaz Slough safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Topaz Slough is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Topaz Slough come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.