Mill Run Reservoir
Mill Run Reservoir in Blair County, Pennsylvania is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 37 acres.
- Area
- 37 acres
Next lake in Blair County
Swipe left or right on this bar to open the next or previous lake.
Why Mill Run Reservoir 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 Mill Run Reservoir, 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 PA DEP and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Mill Run Reservoir is a 37-acre lake in Blair County, Pennsylvania.
Source: EPA Water Quality Portal sampling records, PA DEP, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Mill Run Reservoir 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 Mill Run Reservoir
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 Mill Run Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Mill Run Reservoir in Blair County, Pennsylvania — 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 Mill Run Reservoir
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 37 acres |
No bathymetric survey has been published for Mill Run Reservoir, so its depth is not documented here.
Fishing Mill Run Reservoir
Nearby Lakes in Blair County
Frequently asked questions about Mill Run Reservoir
Where is Mill Run Reservoir?
- Mill Run Reservoir is a lake in Blair County, Pennsylvania. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Mill Run Reservoir?
- Mill Run Reservoir in Blair County, Pennsylvania is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 37 acres.
Is Mill Run Reservoir safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Mill Run Reservoir is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Explore Mill Run Reservoir across LakeQuality
More Pennsylvania Lake Rankings
Other Lakes in Pennsylvania
Where this data comes from
Measurements for Mill Run Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.