Dart Lake
Dart Lake in Becker County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 3 ft visibility. Phosphorus: 61 µg/L. Chlorophyll-a (algae): 22.7 µg/L.
- Clarity
- 3 ft
- Typical in August
- 72°F
- Type
- Eutrophic
- Trend
- ↑ Improving
- Public access
- No
Grade D measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Dart Lake →
Next lake in Becker County
Dart Lake is a productive, nutrient-rich eutrophic lake in Becker County, Minnesota. Water quality is graded D based on 2 sampling years through 2021. Overall water quality is improving over recent sampling years. Limited fish-species data available. No public access — the lake is private or restricted. Compared to the 83 other monitored lakes in Becker County, Dart Lake ranks #76 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2021-08-17. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLimited data
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.
Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum
Water Quality Grade: D (Nutrient-rich)
Very murky, less than 3 ft of visibility. Phosphorus level: 61 µg/L. Chlorophyll-a: 22.7 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3 ft | Not graded |
| Phosphorus | 61 µg/L | Poor |
| Chlorophyll-a (Algae) | 22.7 µg/L | Poor |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Dart Lake
Compare lakeside cabins, hotels, and vacation rentals near Dart Lake in Becker 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. The water-quality grade measures nutrients and algae, not lodging — cabins and rentals around Dart Lake are listed below.
Top-rated places to stay near Dart Lake
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Planning a whole trip? See where to stay at Minnesota’s top lakes →
Water Temperature
Dart Lake typically sits around 72°F at the surface in August. Summer average is about 71°F. Usually warmest in Jul (about 73°F) and coldest in Jun (about 68°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 45 field readings (2011–2021) via the EPA Water Quality Portal. See the full Dart Lake water temperature breakdown →
Fishing Dart Lake
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.117 m/yr | 6 |
| Phosphorus | ↑ Improving | -3.66 µg/L/yr | 6 |
| Chlorophyll-a | ↑ Improving | -1.32 µg/L/yr | 6 |
County Ranking
Ranked #76 of 84 lakes in Becker County
Nearby Lakes With Higher Grades
Dart Lake holds Grade D. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
Nearby Lakes in Becker County
Frequently asked questions about Dart Lake
What is the water quality grade for Dart Lake?
- Dart Lake in Becker County, Minnesota has a water quality grade of D (Nutrient-rich). Water clarity: 3 ft visibility. Phosphorus: 61 µg/L. Chlorophyll-a (algae): 22.7 µg/L.
Is Dart Lake safe to swim in?
- Nutrients and algae run higher than average — check local advisories before swimming, and skip the water if you see scum. Dart Lake has a water quality grade of D (Nutrient-rich). Algae concentration (chlorophyll-a) is 22.7 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Dart Lake?
- Dart Lake typically sits around 72°F at the surface in August, from 45 EPA Water Quality Portal field readings (2011–2021). That is a typical value for the month, not a live reading.
Explore Dart Lake across LakeGrade
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Where this data comes from
23 measurements from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA23 samples · 2021
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.