Si Merrell Slough
Si Merrell Slough in Daniels County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 142 acres.
- Area
- 142 acres
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Why Si Merrell 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 Si Merrell 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 Montana DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Si Merrell Slough is a 142-acre lake in Daniels County, Montana.
Source: EPA Water Quality Portal sampling records, Montana DEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Si Merrell 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 Si Merrell 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 Si Merrell Slough
Compare lakeside cabins, hotels, and vacation rentals near Si Merrell Slough in Daniels County, Montana — 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 Si Merrell Slough
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 142 acres |
No bathymetric survey has been published for Si Merrell Slough, so its depth is not documented here.
Fishing Si Merrell Slough
Nearby Lakes in Daniels County
Frequently asked questions about Si Merrell Slough
Where is Si Merrell Slough?
- Si Merrell Slough is a lake in Daniels County, Montana. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Si Merrell Slough?
- Si Merrell Slough in Daniels County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 142 acres.
Is Si Merrell Slough safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Si Merrell 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 Si Merrell Slough come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.