Lake Five
Flathead County, MontanaView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Public access
- Limited data
Lake Five in Flathead County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 16 ft visibility.
- Clarity
- 16 ft
- Trend
- ↓ Declining
- Public access
- Yes
Stays via Stay22
Stays near Lake Five
Compare lakeside cabins, hotels, and vacation rentals near Lake Five in Flathead 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 Lake Five
Prices for Sep 11–13, 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 trip? Cabins and lodging at Lake Five → · more Montana lake trips
Watch Lake Five’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Why Lake Five has no grade
Lake Five has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Lake Five is Not Rated — not an F. Its 16-foot median from 16 readings collected 2020–2023 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by Montana DEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Lake Five is a lake in Flathead County, Montana. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Montana DEQ, last sampled 2023-09-10. Grade methodology: LakeQuality methodology.
What Lake Five is good for
From access and monitoring records, not editorial picks.
- Clear water16 ft of visibility
- Boat launch1 documented ramp
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Lake Five
These readings exist but are not enough for an A–F grade — see why.
Crystal clear, you can see 16 ft down. TSI 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 16 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Recreation & Access
- Paul's MemorialPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Lake Five
Water Quality Trend: ↓ Declining
Based on 12 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.21 m/yr | 4 |
| Phosphorus | ↓ Declining | +0.5 µg/L/yr | 11 |
| Chlorophyll-a | → Stable | +0.01 µg/L/yr | 12 |
Graded lakes near Lake Five
Lake Five has no grade, but these lakes within a short drive do.
Nearby Lakes in Flathead County
Frequently asked questions about Lake Five
Where is Lake Five?
- Lake Five is a lake in Flathead County, Montana. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Lake Five?
- Lake Five in Flathead County, Montana is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 16 ft visibility.
Is Lake Five safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Lake Five?
- Lake Five has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Paul's Memorial. Public access is listed as yes.
Explore Lake Five across LakeQuality
Planning a trip around Glacier?
Lake Five is about 18 miles from Glacier National Park. Crowds there swing hard by season, so the month you pick changes both how busy the park is and what lodging costs.
Best time to visit Glacier →More Montana Lake Rankings
Other Lakes in Montana
Oligotrophic Lakes in Montana
Where this data comes from
16 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS16 samples · 2020–2023
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory