Grant Lake
Grant Lake in Beltrami County, Minnesota has a water quality grade of A (Excellent). Water clarity: 10.7 ft visibility. Phosphorus: 11.5 µg/L. Chlorophyll-a (algae): 3.6 µg/L. Maximum depth: 92 ft. Surface area: 213.69 acres.
- Clarity
- 10.7 ft
- Typical in August
- 48°F
- Max depth
- 92 ft
- Area
- 214 acres
- Type
- Mesotrophic
- Trend
- ↑ Improving
- Public access
- Yes
Next lake in Beltrami County
Grant Lake is a 214-acre mesotrophic lake in Beltrami County, Minnesota with a maximum depth of 92 feet. Water quality is graded A based on 2 sampling years through 2024. Overall water quality is improving over recent sampling years. The lake supports 15 documented fish species including black bullhead, black crappie, and bluegill. Public access is available with 1 public boat landing. Compared to the 84 other monitored lakes in Beltrami County, Grant Lake ranks #36 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2024-07-31. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLow algae
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.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Good clarity, visible to about 10.7 ft. Phosphorus level: 11.5 µg/L. Chlorophyll-a: 3.6 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.7 ft | Not graded |
| Phosphorus | 11.5 µg/L | Good |
| Chlorophyll-a (Algae) | 3.6 µg/L | Good |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Grant Lake
Compare lakeside cabins, hotels, and vacation rentals near Grant Lake in Beltrami County, Minnesota — 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.
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Water Temperature
Grant Lake typically sits around 48°F at the surface in August. Summer average is about 57°F. Usually warmest in Jun (about 66°F) and coldest in Aug (about 48°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 107 field readings (2016–2025) via the EPA Water Quality Portal. See the full Grant Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 92 ft |
| Surface Area | 214 acres |
| Shoreline Length | 3.7 mi |
| Littoral Zone | 40% |
| Public Access | Yes |
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Recreation & Access
- Grant LakePublic
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Grant Lake
DNR Fisheries Survey Summary
8 surveys on file from MN DNR Fisheries. Most recent: 2025-08-04 (Targeted Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Bluegill | 27.87 | 0.16 lb |
| Green Sunfish | 11.27 | 0.25 lb |
| Tullibee (Cisco) | 10.85 | 0.43 lb |
| CNM | 10.48 | — |
| Black Bullhead | 8.01 | 0.29 lb |
| Largemouth Bass | 7.26 | 0.7 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.
Length Distributions
Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.
Bluegill
Green Sunfish
Tullibee (Cisco)
Black Bullhead
From the 2025-08-04 survey
Temperature and dissolved oxygen (DO) measurements were collected from the deepest basin in Grant Lake on August 4th, 2025, to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Cisco, also known as Tullibee, the most sensitive coldwater species present in this lake.…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Grant Lake. 3 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — GrantFisheries Lake Survey · MN DNR LakeFinder
- —Aquatic Plant Report — Grant (1730)Aquatic Plant Report · MN DNR LakeFinder
- —Public Water Access Sites — GrantPublic Water Access Sites · MN DNR LakeFinder
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.492 m/yr | 3 |
| Phosphorus | ↑ Improving | -0.5 µg/L/yr | 2 |
| Chlorophyll-a | ↑ Improving | -1.4 µg/L/yr | 2 |
County Ranking
Ranked #36 of 85 lakes in Beltrami County
Nearby Lakes in Beltrami County
Frequently asked questions about Grant Lake
What is the water quality grade for Grant Lake?
- Grant Lake in Beltrami County, Minnesota has a water quality grade of A (Excellent). Water clarity: 10.7 ft visibility. Phosphorus: 11.5 µg/L. Chlorophyll-a (algae): 3.6 µg/L. Maximum depth: 92 ft. Surface area: 213.69 acres.
Is Grant Lake safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Grant Lake has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 3.6 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Grant Lake?
- Grant Lake typically sits around 48°F at the surface in August, from 107 EPA Water Quality Portal field readings (2016–2025). That is a typical value for the month, not a live reading.
How deep is Grant Lake?
- Grant Lake has a maximum depth of 92 feet. The lake covers 213.69 acres.
What fish are in Grant Lake?
- Fish species found in Grant Lake include black bullhead, black crappie, bluegill, bowfin (dogfish), brown bullhead, green sunfish, hybrid sunfish, largemouth bass, northern pike, pumpkinseed, rock bass, tullibee (cisco), white sucker, yellow bullhead, yellow perch. Grant Lake is located in Beltrami County, Minnesota.
Are there boat ramps on Grant Lake?
- Grant Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Grant Lake. Public access is listed as yes.
Explore Grant Lake across LakeGrade
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Where this data comes from
30 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA30 samples · 2020–2024
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
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)
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory