Mann Creek Reservoir
Mann Creek Reservoir in Washington County, Idaho is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 230 acres.
- Area
- 230 acres
- Public access
- Yes
Next lake in Washington County
Swipe left or right on this bar to open the next or previous lake.
Why Mann Creek 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 Mann Creek 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 IDEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Mann Creek Reservoir is a 230-acre lake in Washington County, Idaho. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, IDEQ, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Mann Creek 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 Mann Creek 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 Mann Creek Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Mann Creek Reservoir in Washington County, Idaho — 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 Mann Creek Reservoir
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 Idaho’s top lakes →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 230 acres |
| Public Access | Yes |
No bathymetric survey has been published for Mann Creek Reservoir, so its depth is not documented here.
Recreation & Access
- Mann Creek ReservoirPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Mann Creek Reservoir
Nearby Lakes in Washington County
Frequently asked questions about Mann Creek Reservoir
Where is Mann Creek Reservoir?
- Mann Creek Reservoir is a lake in Washington County, Idaho. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Mann Creek Reservoir?
- Mann Creek Reservoir in Washington County, Idaho is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 230 acres.
Is Mann Creek Reservoir safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Mann Creek Reservoir is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
Are there boat ramps on Mann Creek Reservoir?
- Mann Creek Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Mann Creek Reservoir. Public access is listed as yes.
Explore Mann Creek Reservoir across LakeQuality
More Idaho Lake Rankings
Other Lakes in Idaho
Where this data comes from
Measurements for Mann Creek Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory