Northwood Lake
Northwood Lake in Hennepin County, Minnesota has a water quality grade of F (Algae-prone). Water clarity: 1.5 ft visibility. Phosphorus: 194 µg/L. Chlorophyll-a (algae): 74 µg/L.
- Clarity
- 1.5 ft
- Typical in August
- 75°F
- Type
- Hypereutrophic
- Trend
- ↑ Improving
- Public access
- No
Grade F measures nutrients and algae, not whether this is a good place for a cabin trip. Cabins and rentals near Northwood Lake →
Next lake in Hennepin County
Northwood Lake is a highly nutrient-loaded hypereutrophic lake in Hennepin County, Minnesota. Water quality is graded F based on 2 sampling years through 2025. 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 80 other monitored lakes in Hennepin County, Northwood Lake ranks #79 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-09-04. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyAlgae risk
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.
Algae and nutrients are often high — check current advisories before swimming. Skip the water if you see scum or a paint-like bloom
Water Quality Grade: F (Algae-prone)
Very murky, less than 1.5 ft of visibility. Phosphorus level: 194 µg/L. Chlorophyll-a: 74 µg/L. Trophic State Index: 75.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.5 ft | Not graded |
| Phosphorus | 194 µg/L | Poor |
| Chlorophyll-a (Algae) | 74 µg/L | Poor |
| Trophic State Index (TSI) | 75 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Where to stay near Northwood Lake
Compare lakeside cabins, hotels, and vacation rentals near Northwood Lake in Hennepin 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 Northwood Lake are listed below.
Top-rated places to stay near Northwood Lake
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Planning a whole trip? See where to stay at Minnesota’s top lakes →
Water Temperature
Northwood Lake typically sits around 75°F at the surface in August. Summer average is about 77°F. Usually warmest in Jul (about 82°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 55 field readings (2010–2025) via the EPA Water Quality Portal. See the full Northwood Lake water temperature breakdown →
Fishing Northwood Lake
Water Quality Trend: ↑ Improving
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.131 m/yr | 6 |
| Phosphorus | ↓ Declining | +8.79 µg/L/yr | 3 |
| Chlorophyll-a | ↑ Improving | -5.45 µg/L/yr | 3 |
EPA Impairment Status
Northwood Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MN27-0627-00 · Official waterbody report
County Ranking
Ranked #79 of 81 lakes in Hennepin County
Nearby Lakes With Higher Grades
Northwood Lake holds Grade F. 3 nearby lakes hold higher nutrient-and-algae grades — useful for a swim day, not a reason to skip lodging here.
See full comparison →Nearby Lakes in Hennepin County
Frequently asked questions about Northwood Lake
What is the water quality grade for Northwood Lake?
- Northwood Lake in Hennepin County, Minnesota has a water quality grade of F (Algae-prone). Water clarity: 1.5 ft visibility. Phosphorus: 194 µg/L. Chlorophyll-a (algae): 74 µg/L.
Is Northwood Lake safe to swim in?
- Algae and nutrients are often high — check current advisories before swimming. Skip the water if you see scum or a paint-like bloom. Northwood Lake has a water quality grade of F (Algae-prone). Algae concentration (chlorophyll-a) is 74 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Northwood Lake?
- Northwood Lake typically sits around 75°F at the surface in August, from 55 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
Explore Northwood Lake across LakeGrade
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Where this data comes from
73 measurements from 1 monitoring station, 2022–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA73 samples · 2022–2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Two Reagent Colorimetry
- Phosphorus by Colorimetry
- Analysis of Chlorophyll in Periphyton and Plankton
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidity, Nephelometric Method
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
Impairment status from EPA ATTAINS 303(d) database