Rogers Lake
Flathead County, MontanaView mapDirections
Montana DEQ publishes the water-quality measurements for Rogers Lake. Here is what has been measured.
- Mesotrophic
- 19 ft max depth
Rogers Lake in Flathead County, Montana has water-quality measurements published by Montana DEQ, shown here as reported. Phosphorus: 11.6 µg/L. Chlorophyll-a (algae): 2.6 µg/L.
Rogers Lake is a mesotrophic lake in Flathead County, Montana with an estimated average depth of about 19 feet. Overall water quality is declining over recent sampling years. Compared to the 43 other monitored lakes in Flathead County, Rogers Lake ranks #39 for water quality.
Source: EPA Water Quality Portal sampling records, Montana DEQ, last sampled 2023-07-11. Methodology: how these readings are compared.
Swimming conditions
Readings onlyElevated nutrients
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Rogers Lake 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.
Water quality measurements for Rogers Lake
These are the measurements Montana DEQ publishes for Rogers Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 11.6 µg/L. Chlorophyll-a 2.6 µg/L. TSI 40.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 11.6µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2.6µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 40 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Rogers Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~19 ft est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Montana has not published bathymetry for Rogers Lake.
Lake Size & Watershed
Watershed (drainage) area
6 sq mi
HydroLAKES / HydroSHEDS
Surface area
198 acres
HydroLAKES / HydroSHEDS
Shoreline
2.4 mi
HydroLAKES / HydroSHEDS
Elevation
3,904 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Stays via Stay22
Stays near Rogers Lake
Compare lakeside cabins, hotels, and vacation rentals near Rogers Lake 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Rogers Lake are listed below.
Top-rated places to stay near Rogers Lake
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
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Fishing Rogers Lake
Water Quality Trend: Worsening
Based on 12 years of monitoring (2012–2023).
Phosphorus
Worsening+0.39 µg/L/yr11 years
Chlorophyll-a
Worsening+0.1 µg/L/yr12 years
Nearby Lakes in Flathead County
Frequently asked questions about Rogers Lake
Where is Rogers Lake?
- Rogers Lake is a lake in Flathead County, Montana. Its water-quality measurements are published by Montana DEQ and shown on this page as reported.
What is the water quality of Rogers Lake?
- Rogers Lake in Flathead County, Montana has water-quality measurements published by Montana DEQ, shown here as reported. Phosphorus: 11.6 µg/L. Chlorophyll-a (algae): 2.6 µg/L.
Is Rogers Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Rogers Lake?
- No published bathymetric survey covers Rogers Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 19 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Explore Rogers Lake across LakeQuality
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Where this data comes from
26 measurements from 1 monitoring station, 2012–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Montana Watershed
MTWTRSHD_WQX26 samples · 2012–2023
Analytical methods
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- 445.0 ~ EPA; Chlorophyll and Pheophytin in Algae by Fluorescence
- 4500 N C ~ Persufate Method for Total Nitrogen
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)