Jarvis Beach Lake
Rolette County, North DakotaView mapDirections
No nutrient or algae sampling on record from ND DEQ for this lake.
- Public access
- Limited data
Jarvis Beach Lake in Rolette County, North Dakota has water-quality measurements published by ND DEQ, shown here as reported.
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. Methodology: how these readings are compared.
Swimming conditions
No readingBacteria tested: exceedances
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.
Whether Jarvis Beach Lake is safe to swim in today is a call for the North Dakota Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Jarvis Beach Lake
These are the measurements ND DEQ publishes for Jarvis Beach Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data.
Ask about Jarvis Beach Lake
Answers come straight from the public measurements and survey records on this page.
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.
Column height runs from this lake’s coldest month (52°F) to its warmest (72°F).
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 →
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Stays near Jarvis Beach Lake
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Fishing Jarvis Beach Lake
Water Quality Trend: Worsening
Based on 5 years of monitoring (2021–2025).
Water clarity
Stable5 years
Phosphorus
Worsening+4.1 µg/L/yr5 years
Chlorophyll-a
Worsening+0.58 µg/L/yr4 years
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. Its water-quality measurements are published by ND DEQ and shown on this page as reported.
What is the water quality of Jarvis Beach Lake?
- Jarvis Beach Lake in Rolette County, North Dakota has water-quality measurements published by ND DEQ, shown here as reported.
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 is a historical summary of past bacteria testing, not a current reading and not a swimming clearance. Bacteria levels can spike quickly after heavy rain, so whether Jarvis Beach Lake is safe to swim in today is a call for North Dakota's water agency and the county health department; check their current beach 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.
Can I fish at Jarvis Beach Lake?
- Public access to Jarvis Beach Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by North Dakota's fish and wildlife agency, so check its current regulations before you go.
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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)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.