Rogers Lake
Flathead County, MontanaView mapDirections
Nutrients and algae run above the regional average.
↓ down from A at the last regrade
- Mesotrophic
- #39 of 44 in the county
- 19 ft max depth
Rogers Lake in Flathead County, Montana has a water quality grade of D (Nutrient-rich). Phosphorus: 11.6 µg/L. Chlorophyll-a (algae): 2.6 µg/L.
- Max depth
- ~19 ft est.
- Type
- Mesotrophic
- Phosphorus
- 11.6 µg/L
- Chlorophyll-a
- 2.6 µg/L
- Trend
- ↓ Declining
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 grade measures nutrients and algae, not lodging — cabins and rentals around Rogers Lake are listed below.
Top-rated places to stay near Rogers Lake
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Watch Rogers Lake’s letter
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Rogers Lake is a mesotrophic lake in Flathead County, Montana with an estimated average depth of about 19 feet. Water quality is graded D based on 3 sampling years through 2023. 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. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyElevated nutrients
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus 11.6 µg/L. Chlorophyll-a 2.6 µg/L. TSI 40. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 11.6 µg/L | Good |
| Chlorophyll-a (Algae) | 2.6 µg/L | Fair |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~19 ft est. |
| Average Depth | ~17 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
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.
Fishing Rogers Lake
Water Quality Trend: ↓ Declining
Based on 12 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +0.39 µg/L/yr | 11 |
| Chlorophyll-a | ↓ Declining | +0.1 µg/L/yr | 12 |
County Ranking
Ranked #39 of 44 lakes in Flathead County
Nearby Lakes With Higher Grades
Rogers Lake holds Grade D. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Flathead County
Frequently asked questions about Rogers Lake
Where is Rogers Lake?
- Rogers Lake is a lake in Flathead County, Montana. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Rogers Lake?
- Rogers Lake in Flathead County, Montana has a water quality grade of D (Nutrient-rich). Phosphorus: 11.6 µg/L. Chlorophyll-a (algae): 2.6 µg/L.
Is Rogers Lake safe to swim in?
- The D is nutrients and algae, 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
More Montana Lake Rankings
Other Grade D Lakes in Montana
Mesotrophic Lakes in Montana
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)
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
Lake size & watershed from HydroLAKES (HydroSHEDS)