Dickey Lake
Lincoln County, MontanaView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from A at the last regrade
- Mesotrophic
- #8 of 18 in the county
- 75 ft max depth
Dickey Lake in Lincoln County, Montana has a water quality grade of C (Fair). Phosphorus: 11.3 µg/L. Chlorophyll-a (algae): 2.2 µg/L.
- Max depth
- ~75 ft est.
- Type
- Mesotrophic
- Phosphorus
- 11.3 µg/L
- Chlorophyll-a
- 2.2 µg/L
- Trend
- ↓ Declining
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Watch Dickey Lake’s letter
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Dickey Lake is a mesotrophic lake in Lincoln County, Montana with an estimated average depth of about 75 feet. Water quality is graded C based on 3 sampling years through 2023. Overall water quality is declining over recent sampling years. Compared to the 17 other monitored lakes in Lincoln County, Dickey Lake ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, Montana DEQ, last sampled 2023-07-24. Grade methodology: LakeQuality methodology.
What Dickey Lake is good for
From access and monitoring records, not editorial picks.
- Camping1 public campground nearby
Swimming Safety
Grade onlyModerate
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 C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: C (Fair)
No clarity data. Phosphorus 11.3 µg/L. Chlorophyll-a 2.2 µg/L. TSI 39. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 11.3 µg/L | Good |
| Chlorophyll-a (Algae) | 2.2 µg/L | Fair |
| Trophic State Index (TSI) | 39 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~75 ft est. |
| Average Depth | ~48 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 Dickey 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.
Recreation & Access
Public campgrounds near Dickey Lake
- North Dickey Lake1.7 km
Nearest public campgrounds in the USGS National Map inventory, within about 3 miles. An empty list means USGS records no campground that close, which is not the same as camping being unavailable. Where the source gives an official reservation link, it is used; the cabin and hotel search does not cover campsites. More camping lakes
Fishing Dickey Lake
Water Quality Trend: ↓ Declining
Based on 12 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +1.67 µg/L/yr | 11 |
| Chlorophyll-a | ↓ Declining | +0.14 µg/L/yr | 12 |
County Ranking
Ranked #8 of 18 lakes in Lincoln County
Nearby Lakes in Lincoln County
Frequently asked questions about Dickey Lake
Where is Dickey Lake?
- Dickey Lake is a lake in Lincoln County, Montana. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Dickey Lake?
- Dickey Lake in Lincoln County, Montana has a water quality grade of C (Fair). Phosphorus: 11.3 µg/L. Chlorophyll-a (algae): 2.2 µg/L.
Is Dickey Lake safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
How deep is Dickey Lake?
- No published bathymetric survey covers Dickey Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 75 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there campgrounds on Dickey Lake?
- Dickey Lake has 1 public campground from USGS The National Map within 5 km, including North Dickey Lake. This is a location join, not a booking. Cabins and hotels are listed separately; campsite reservations use the official link when the source provides one.
Explore Dickey Lake across LakeQuality
More Montana Lake Rankings
Other Grade C 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)
Public campgrounds from USGS The National Map Structures, within about 3 miles