Belcourt Lake Beach
Rolette County, North Dakota827 acresView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Public access
- Limited data
Belcourt Lake Beach in Rolette County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1 ft visibility. Surface area: 827 acres.
- Clarity
- 1 ft
- Typical in August
- 69°F
- Area
- 827 acres
- Trend
- ↓ Declining
- Public access
- Yes
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Watch Belcourt Lake Beach’s letter
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Why Belcourt Lake Beach has no grade
Belcourt Lake Beach has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Belcourt Lake Beach is Not Rated — not an F. Its 1-foot median from 20 readings collected 2022–2025 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by NDDEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Belcourt Lake Beach is a 827-acre lake in Rolette County, North Dakota. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2025-09-10. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedBacteria C
Based on E. coli testing, Belcourt Lake Beach occasionally exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 5.3% of 38 samples across 7 seasons.
This is a historical summary of past testing, not a current condition — bacteria levels change quickly, especially after rain. Always check North Dakota’s current beach and health-department advisories before swimming.
Water quality measurements for Belcourt Lake Beach
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1 ft of visibility. TSI 77.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 77 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Water Temperature
Belcourt Lake Beach typically sits around 69°F at the surface in August. Summer average is about 69°F. Usually warmest in Jul (about 73°F) and coldest in Jun (about 65°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 9 field readings (2012–2025) via the EPA Water Quality Portal.
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 827 acres |
| Public Access | Yes |
No bathymetric survey has been published for Belcourt Lake Beach, so its depth is not documented here.
Fishing Belcourt Lake Beach
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.05 m/yr | 5 |
| Phosphorus | ↓ Declining | +3.25 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +0.3 µg/L/yr | 4 |
Reservoir Info (USACE NID)
Belcourt Lake Beach is a man-made reservoir impounded by the Belcourt Lake (completed 1930), built primarily for recreation on the Ox Creek; earth-type dam, 13 ft tall and 700 ft long.
- Surface area
- 827 ac
- Normal storage
- 5,651 ac-ft
- Max storage
- 9,159 ac-ft
- Drainage area
- 28.4 sq mi
- Hazard class
- High
- Owner
- BIA
All listed purposes: Recreation;Fish and Wildlife Pond;Water Supply.
Source: USACE National Inventory of Dams, NID ID ND00535 · Operator website · Matched by proximity (0.13 km)
Graded lakes near Belcourt Lake Beach
Belcourt Lake Beach has no grade, but these lakes within a short drive do.
Nearby Lakes in Rolette County
Frequently asked questions about Belcourt Lake Beach
Where is Belcourt Lake Beach?
- Belcourt Lake Beach is a lake in Rolette County, North Dakota. LakeQuality has not rated this lake (UNRATED) — the only measurement available is water clarity, which is not a water-quality indicator on its own — EPA's National Lakes Assessment does not grade clarity.
What is the water quality grade for Belcourt Lake Beach?
- Belcourt Lake Beach in Rolette County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1 ft visibility. Surface area: 827 acres.
Is Belcourt Lake Beach safe to swim in?
- Based on E. coli testing, Belcourt Lake Beach occasionally exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 5.3% of 38 samples across 7 seasons. That works out to a bacteria swim-safety grade of C — a historical summary of past testing, not a current reading. Belcourt Lake Beach is not rated for water quality — its monitoring record does not meet the evidence bar. Bacteria levels can spike quickly after heavy rain, so always check North Dakota's current beach and health-department advisories before you swim.
What is the water temperature of Belcourt Lake Beach?
- Belcourt Lake Beach typically sits around 69°F at the surface in August, from 9 EPA Water Quality Portal field readings (2012–2025). That is a typical value for the month, not a live reading.
Explore Belcourt Lake Beach across LakeQuality
Depth, room, public access, and the state wake-sport rules
Species activity outlook by water temperature and season
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Where this data comes from
20 measurements from 1 monitoring station, 2022–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Turtle Mountain Environmental Office (Tribal)
TURTLEMT20 samples · 2022–2025
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
Depth, fish, and access data from North Dakota Game & Fish