Left Hand Valley Reservoir
Left Hand Valley Reservoir in Boulder County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 110 acres.
- Area
- 110 acres
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Why Left Hand Valley 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 Left Hand Valley 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 CDPHE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Left Hand Valley Reservoir is a 110-acre lake in Boulder County, Colorado.
Source: EPA Water Quality Portal sampling records, CDPHE, 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 Left Hand Valley 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 Left Hand Valley Reservoir
Compare lakeside cabins, hotels, and vacation rentals near Left Hand Valley Reservoir in Boulder County, Colorado — 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 Left Hand Valley Reservoir
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 110 acres |
No bathymetric survey has been published for Left Hand Valley Reservoir, so its depth is not documented here.
Fishing Left Hand Valley Reservoir
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Frequently asked questions about Left Hand Valley Reservoir
Where is Left Hand Valley Reservoir?
- Left Hand Valley Reservoir is a lake in Boulder County, Colorado. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Left Hand Valley Reservoir?
- Left Hand Valley Reservoir in Boulder County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 110 acres.
Is Left Hand Valley Reservoir safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Left Hand Valley Reservoir 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 Left Hand Valley Reservoir come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.