Deer Island Slough
Deer Island Slough in Columbia County, Oregon is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 46 acres.
- Area
- 46 acres
Next lake in Columbia County
Swipe left or right on this bar to open the next or previous lake.
Why Deer Island 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 Deer Island 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 Oregon DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Deer Island Slough is a 46-acre lake in Columbia County, Oregon.
Source: EPA Water Quality Portal sampling records, Oregon DEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Deer Island Slough 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 Deer Island 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 Deer Island Slough
Compare lakeside cabins, hotels, and vacation rentals near Deer Island Slough in Columbia County, Oregon — 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 Deer Island Slough
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 Oregon’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 46 acres |
No bathymetric survey has been published for Deer Island Slough, so its depth is not documented here.
Fishing Deer Island Slough
Nearby Lakes in Columbia County
Frequently asked questions about Deer Island Slough
Where is Deer Island Slough?
- Deer Island Slough is a lake in Columbia County, Oregon. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Deer Island Slough?
- Deer Island Slough in Columbia County, Oregon is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 46 acres.
Is Deer Island Slough safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Deer Island 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 Deer Island Slough across LakeQuality
More Oregon Lake Rankings
Other Lakes in Oregon
Where this data comes from
Measurements for Deer Island Slough come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.