Mosquito Flat Reservoir
Mosquito Flat Reservoir in Custer County, Idaho is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 49 acres.
- Area
- 49 acres
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Why Mosquito Flat 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 Mosquito Flat 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.
Mosquito Flat Reservoir is a 49-acre lake in Custer County, Idaho. 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.
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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 Mosquito Flat 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 Mosquito Flat Reservoir
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 49 acres |
No bathymetric survey has been published for Mosquito Flat Reservoir, so its depth is not documented here.
Recreation & Access
- Mosquito Flat ReservoirSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Mosquito Flat Reservoir
Nearby Lakes in Custer County
Frequently asked questions about Mosquito Flat Reservoir
Where is Mosquito Flat Reservoir?
- Mosquito Flat Reservoir is a lake in Custer 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 Mosquito Flat Reservoir?
- Mosquito Flat Reservoir in Custer County, Idaho is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 49 acres.
Is Mosquito Flat Reservoir safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Mosquito Flat 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 Mosquito Flat Reservoir?
- Mosquito Flat Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Mosquito Flat Reservoir.
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Where this data comes from
Measurements for Mosquito Flat 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