Where is Helena Valley Regulating Reservoir?

Helena Valley Regulating Reservoir is a lake in Lewis and Clark County, Montana. Its water-quality measurements are published by Montana DEQ and shown on this page as reported.

Helena Valley Regulating Reservoir

Lewis and Clark County, Montana564 acresView map Directions

No nutrient or algae sampling on record from Montana DEQ for this lake.

Area

564 acres

Surface area

Shoreline

6.2 mi

Measured length

See the measurements Directions Where to stay

Helena Valley Regulating Reservoir in Lewis and Clark County, Montana has water-quality measurements published by Montana DEQ, shown here as reported. Surface area: 564 acres.

Loading map…

Helena Valley Regulating Reservoir is a 564-acre lake in Lewis and Clark County, Montana.

Source: EPA Water Quality Portal sampling records, Montana DEQ. Methodology: how these readings are compared.

Swimming conditions

No reading

Not rated

Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.

Whether Helena Valley Regulating Reservoir is safe to swim in today is a call for the Montana Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.

Get alerts for Helena Valley Regulating Reservoir →

Water quality measurements for Helena Valley Regulating Reservoir

These are the measurements Montana DEQ publishes for Helena Valley Regulating Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.

No clarity data. TSI undefined.

Ask about Helena Valley Regulating Reservoir

Answers come straight from the public measurements and survey records on this page.

Lake Details

Surface area

564 acres

Shoreline

6.2 mi

No bathymetric survey has been published for Helena Valley Regulating Reservoir, so its depth is not documented here.

Stays via Stay22

Stays near Helena Valley Regulating Reservoir

Compare lakeside cabins, hotels, and vacation rentals near Helena Valley Regulating Reservoir in Lewis and Clark County, Montana — 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 Helena Valley Regulating Reservoir

Prices for Oct 16–18, 4 adults. Change dates on the map below.

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 Montana’s top lakes →

Follow Helena Valley Regulating Reservoir’s readings

Email me when new measurements post for this lake. Updates stay free.

Or email

Fishing Helena Valley Regulating Reservoir

→ Helena Valley Regulating Reservoir fishing regulations (limits, seasons, special rules)

Nearby Lakes in Lewis and Clark County

Lake Helena OutletHypereutrophic4.5 miView →Lake Helena Center Deep5.6 ft clear4.7 miView →Hauser Lake D21.8 ft clear5.8 miView →Holter Reservoir19 ft clear—View →Chessman Reservoir—View →Scott Reservoir—View →

Frequently asked questions about Helena Valley Regulating Reservoir

Where is Helena Valley Regulating Reservoir?: Helena Valley Regulating Reservoir is a lake in Lewis and Clark County, Montana. Its water-quality measurements are published by Montana DEQ and shown on this page as reported.
What is the water quality of Helena Valley Regulating Reservoir?: Helena Valley Regulating Reservoir in Lewis and Clark County, Montana has water-quality measurements published by Montana DEQ, shown here as reported. Surface area: 564 acres.
Is Helena Valley Regulating Reservoir safe to swim in?: Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.