Jarvis Beach Lake
Rolette County, North DakotaView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Public access
- Limited data
Jarvis Beach Lake in Rolette County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar.
- Typical in August
- 67°F
- Trend
- ↓ Declining
- Public access
- Yes
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Stays near Jarvis Beach Lake
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Watch Jarvis Beach Lake’s letter
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Why Jarvis Beach Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Jarvis Beach Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. 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.
Jarvis Beach Lake is a 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 2021-06-29. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedBacteria C
Based on E. coli testing, Jarvis Beach Lake occasionally exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 7.1% of 14 samples across 3 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 Jarvis Beach Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples |
Water Temperature
Jarvis Beach Lake typically sits around 67°F at the surface in August. Summer average is about 67°F. Usually warmest in Jul (about 72°F) and coldest in Apr (about 52°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 29 field readings (2010–2020) via the EPA Water Quality Portal. See the full Jarvis Beach Lake water temperature breakdown →
Fishing Jarvis Beach Lake
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | +0.01 m/yr | 5 |
| Phosphorus | ↓ Declining | +4.1 µg/L/yr | 5 |
| Chlorophyll-a | ↓ Declining | +0.58 µg/L/yr | 4 |
Graded lakes near Jarvis Beach Lake
Jarvis Beach Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Rolette County
Frequently asked questions about Jarvis Beach Lake
Where is Jarvis Beach Lake?
- Jarvis Beach Lake is a lake in Rolette County, North Dakota. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Jarvis Beach Lake?
- Jarvis Beach Lake in Rolette County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar.
Is Jarvis Beach Lake safe to swim in?
- Based on E. coli testing, Jarvis Beach Lake occasionally exceeded the EPA safe-swimming threshold (235 MPN/100mL) — on 7.1% of 14 samples across 3 seasons. That works out to a bacteria swim-safety grade of C — a historical summary of past testing, not a current reading. Jarvis Beach Lake 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 Jarvis Beach Lake?
- Jarvis Beach Lake typically sits around 67°F at the surface in August, from 29 EPA Water Quality Portal field readings (2010–2020). That is a typical value for the month, not a live reading.
Explore Jarvis Beach Lake across LakeQuality
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Where this data comes from
2 measurements from 1 monitoring station, 2020–2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Turtle Mountain Environmental Office (Tribal)
TURTLEMT2 samples · 2020–2021
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.