Old River Slough
Old River Slough in Catahoula County, Louisiana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 259 acres.
- Area
- 259 acres
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Why Old River 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 Old River 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 your state environmental agency and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Old River Slough is a 259-acre lake in Catahoula County, Louisiana.
Source: EPA Water Quality Portal sampling records, your state environmental agency, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Old River 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 Old River 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 Old River Slough
Compare lakeside cabins, hotels, and vacation rentals near Old River Slough in Catahoula County, Louisiana — 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 Old River Slough
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 259 acres |
No bathymetric survey has been published for Old River Slough, so its depth is not documented here.
Fishing Old River Slough
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Frequently asked questions about Old River Slough
Where is Old River Slough?
- Old River Slough is a lake in Catahoula County, Louisiana. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Old River Slough?
- Old River Slough in Catahoula County, Louisiana is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 259 acres.
Is Old River Slough safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Old River Slough is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Old River Slough across LakeQuality
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Where this data comes from
Measurements for Old River Slough come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.