What is the water quality grade for Gravel Lake?

Gravel Lake in Rolette County, North Dakota received a water quality grade of D (Poor). Water clarity: 6.1 ft visibility. Maximum depth: 21.6 ft. Surface area: 112.7 acres.

Is Gravel Lake safe to swim in?

Swimming not recommended, poor water quality with high algae risk. Gravel Lake has an overall water quality grade of D. Always check local health department advisories before swimming.

How deep is Gravel Lake?

Gravel Lake has a maximum depth of 21.6 feet and an average depth of 11.4 feet. The lake covers 112.7 acres.

What fish are in Gravel Lake?

Fish species found in Gravel Lake include Northern Pike, Walleye, Yellow Perch, Bluegill. Gravel Lake is located in Rolette County, North Dakota.

Rolette County, North Dakota

Gravel Lake

Grade DPoor · 6.1 ft clarity

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Limited DataEutrophic

Gravel Lake is a 113-acre productive, nutrient-rich eutrophic lake in Rolette County, North Dakota with a maximum depth of 22 feet (11-foot average). Water quality is graded D based on 1 sampling years through 2025. Overall water quality is declining over recent sampling years. The lake supports 4 documented fish species including Northern Pike, Walleye, and Yellow Perch. Public access is available with 1 public boat landing. Compared to the 13 other monitored lakes in Rolette County, Gravel Lake ranks #12 for water quality.

Source: EPA Water Quality Portal sampling records, North Dakota DNR, last sampled 2025-10-01. Grade methodology: LakeGrade methodology.

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Swimming Safety

Swimming not recommended, poor water quality with high algae risk

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Water Quality Grade: D, Poor

Murky, only visible to about 6.1 ft. Trophic State Index: 51.

Metric	Value	Grade
Water Clarity (Secchi Depth)	6.1 ft	D
Phosphorus	No data
Chlorophyll-a (Algae)	No data
Trophic State Index (TSI)	51	Eutrophic

High nutrients, frequent algae, reduced clarity

Lake Details

Characteristic	Value
Maximum Depth	21.6 ft
Average Depth	11.4 ft
Surface Area	113 acres
Shoreline Length	2.7 mi
Public Access	Yes

Where to stay near Gravel Lake

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Fish Species

Northern Pike Walleye Yellow Perch Bluegill

Click a species to see every graded lake where it is documented.

Fishing Gravel Lake

Invasive & Introduced Species

Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.

tiger muskellunge(since 1975)

Source: USGS Nonindigenous Aquatic Species (NAS) Database. Hover a chip to see scientific name, ecological context, status, and first-observed year.

Water Quality Trend: ↓ Declining

Based on 2 years of monitoring data (2020-2025).

Metric	Trend	Change/Year	Years
Water Clarity	↓ Declining	-0.27 m/yr	2

Recreation & Access

Boat Landings

Yes

Public Access

Water Temperature

Gravel Lake averages about 69°F at the surface in summer, usually warmest in Jul (about 72°F) and coldest in May (about 57°F). These are typical values by month — not a live reading.