Netta Lake
Netta Lake in Anoka County, Minnesota has a water quality grade of A (Excellent). Water clarity: 11.3 ft visibility. Phosphorus: 14.5 µg/L. Chlorophyll-a (algae): 4.6 µg/L.
- Clarity
- 11.3 ft
- Typical in August
- 75°F
- Max depth
- ~35 ft est.
- Type
- Mesotrophic
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Anoka County
Netta Lake is a mesotrophic lake in Anoka County, Minnesota with an estimated average depth of about 35 feet. Water quality is graded A based on 2 sampling years through 2023. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 22 other monitored lakes in Anoka County, Netta Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2023-09-19. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyLow algae
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.
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A (Excellent)
Good clarity, visible to about 11.3 ft. Phosphorus level: 14.5 µg/L. Chlorophyll-a: 4.6 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.3 ft | Not graded |
| Phosphorus | 14.5 µg/L | Good |
| Chlorophyll-a (Algae) | 4.6 µg/L | Good |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Netta Lake
Compare lakeside cabins, hotels, and vacation rentals near Netta Lake in Anoka 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.
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Water Temperature
Netta Lake typically sits around 75°F at the surface in August. Summer average is about 74°F. Usually warmest in Aug (about 75°F) and coldest in May (about 62°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 155 field readings (2010–2023) via the EPA Water Quality Portal. See the full Netta Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~35 ft est. |
| Average Depth | ~9 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Minnesota has not published bathymetry for Netta Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Gladys Jones ParkPublic
Fishing Netta Lake
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Netta Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Public Water Access Sites — NettaPublic Water Access Sites · MN DNR LakeFinder
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | 0 m/yr | 2 |
| Phosphorus | → Stable | +0.25 µg/L/yr | 2 |
| Chlorophyll-a | ↓ Declining | +0.3 µg/L/yr | 2 |
EPA Impairment Status
Netta Lake is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 4A).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit MN02-0053-00 · Official waterbody report · Matched by proximity (2.75 km)
County Ranking
Ranked #5 of 23 lakes in Anoka County
Nearby Lakes in Anoka County
Frequently asked questions about Netta Lake
What is the water quality grade for Netta Lake?
- Netta Lake in Anoka County, Minnesota has a water quality grade of A (Excellent). Water clarity: 11.3 ft visibility. Phosphorus: 14.5 µg/L. Chlorophyll-a (algae): 4.6 µg/L.
Is Netta Lake safe to swim in?
- Excellent for swimming, crystal clear water with minimal algae. Netta Lake has a water quality grade of A (Excellent). Algae concentration (chlorophyll-a) is 4.6 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Netta Lake?
- Netta Lake typically sits around 75°F at the surface in August, from 155 EPA Water Quality Portal field readings (2010–2023). That is a typical value for the month, not a live reading.
How deep is Netta Lake?
- No published bathymetric survey covers Netta Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 35 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
Are there boat ramps on Netta Lake?
- Netta Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Gladys Jones Park. Public access is listed as yes.
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Where this data comes from
65 measurements from 1 monitoring station, 2021–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA65 samples · 2021–2023
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder
Named boat-access points from the USGS National Boat Ramps inventory