Willow Slough Marsh
Willow Slough Marsh in Jefferson County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 44 acres.
- Area
- 44 acres
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Why Willow Slough Marsh 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 Willow Slough Marsh, 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 TCEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Willow Slough Marsh is a 44-acre lake in Jefferson County, Texas.
Source: EPA Water Quality Portal sampling records, TCEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
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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 Willow Slough Marsh
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 Willow Slough Marsh
Compare lakeside cabins, hotels, and vacation rentals near Willow Slough Marsh in Jefferson County, Texas — 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 Willow Slough Marsh
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 44 acres |
No bathymetric survey has been published for Willow Slough Marsh, so its depth is not documented here.
Fishing Willow Slough Marsh
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Frequently asked questions about Willow Slough Marsh
Where is Willow Slough Marsh?
- Willow Slough Marsh is a lake in Jefferson County, Texas. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Willow Slough Marsh?
- Willow Slough Marsh in Jefferson County, Texas is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 44 acres.
Is Willow Slough Marsh safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Willow Slough Marsh 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 Willow Slough Marsh come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.