St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake
St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake in Douglas County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.6 ft visibility. Phosphorus: 65.5 µg/L. Chlorophyll-a (algae): 2 µg/L.
- Clarity
- 1.6 ft
- Typical in August
- 71°F
- Mean depth
- ~481 ft est.
- Trend
- ↓ Declining
- Public access
- Yes
Next lake in Douglas County
Why St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake has no grade
We grade a lake only when its monitoring record clears the evidence bar: 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 St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake, no EPA ecoregion for this lake, so the National Lakes Assessment condition thresholds cannot be applied. Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
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 WI DNR and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake is a lake in Douglas County, Wisconsin with an estimated average depth of about 481 feet. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-09-22. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not ratedLimited data
Not rated for swimming — there is not enough monitoring data to judge this lake
Compare the safest swimming lakes near Duluth →
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Water quality measurements for St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake
These readings exist but do not meet the evidence bar for an A–F grade — see why.
Very murky, less than 1.6 ft of visibility. Phosphorus level: 65.5 µg/L. Chlorophyll-a: 2 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.6 ft | Not graded |
| Phosphorus | 65.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 2 µg/L | Not graded |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake
Compare lakeside cabins, hotels, and vacation rentals near St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake in Douglas County, Wisconsin — 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
St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake typically sits around 71°F at the surface in August. Summer average is about 70°F. Usually warmest in Jul (about 77°F) and coldest in May (about 58°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 9 field readings (2025–2025) via the EPA Water Quality Portal. See the full St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~481 ft est. |
| Public Access | Yes |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Wisconsin has not published bathymetry for St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge 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
- Rice's PointPublic
Fishing St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Source: USGS Nonindigenous Aquatic Species (NAS) Database. Hover a chip to see scientific name, ecological context, status, and first-observed year.
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -0.48 m/yr | 2 |
EPA Impairment Status
St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge 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 WI10025422 · Official waterbody report · Matched by proximity (1.19 km)
Regulated Pollution Sources Nearby
7 EPA-permitted facilities operate within about 5 miles of St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake under Clean Water Act (NPDES) discharge permits, including 1 classified by the EPA as major discharger. 1 facility has a reported Clean Water Act violation in the past three years.
- Wlssd WwtpDuluth · 1.1 mi away · NPDES MN0049786MajorRecent violation
- Erie Pier Processing & Reuse FacilityDuluth · 0.6 mi away · NPDES MN0052612
- Northland PierDuluth · 1.1 mi away · NPDES MN0069141
- Western Lake Superior Sanitary DistrictDuluth · 1.3 mi away · NPDES WI0032263
- Alberta Clipper & Southern LigDuluth · 1.3 mi away · NPDES MN0069426
- Georgia Pacific CorpDuluth · 1.7 mi away · NPDES MN0046043
Facilities permitted to discharge under the Clean Water Act within ~5 miles; proximity does not by itself mean a facility affects this lake. Source: EPA ECHO (ICIS-NPDES), as of 2026-07.
Graded lakes near St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake
St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Douglas County
Frequently asked questions about St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake
What is the water quality grade for St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake?
- St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake in Douglas County, Wisconsin is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1.6 ft visibility. Phosphorus: 65.5 µg/L. Chlorophyll-a (algae): 2 µg/L.
Is St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Algae concentration (chlorophyll-a) is 2 µg/L. Always check local health department advisories before swimming.
What is the water temperature of St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake?
- St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake typically sits around 71°F at the surface in August, from 9 EPA Water Quality Portal field readings (2025–2025). That is a typical value for the month, not a live reading.
How deep is St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake?
- No published bathymetric survey covers St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 481 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 St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake?
- St. Louis River Outlet Upstream of John A. Blatnik Memorial Bridge Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Rice's Point. Public access is listed as yes.
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Where this data comes from
36 measurements from 1 monitoring station, 2024–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA36 samples · 2024–2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by 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
Regulated discharger data from EPA ECHO (ICIS-NPDES)
Lake size & watershed from HydroLAKES (HydroSHEDS)
Fish and recreation data from Wisconsin DNR Lakes
Named boat-access points from the USGS National Boat Ramps inventory