Loeb Lake
Loeb Lake in Ramsey County, Minnesota has a water quality grade of C (Fair). Water clarity: 11.2 ft visibility. Phosphorus: 29 µg/L. Chlorophyll-a (algae): 4 µg/L. Maximum depth: 28 ft. Surface area: 8.52 acres.
- Clarity
- 11.2 ft
- Typical in August
- 63°F
- Max depth
- 28 ft
- Area
- 9 acres
- Type
- Mesotrophic
- Trend
- ↓ Declining
- Public access
- No
Next lake in Ramsey County
Loeb Lake is a 9-acre mesotrophic lake in Ramsey County, Minnesota with a maximum depth of 28 feet. Water quality is graded C based on 2 sampling years through 2025. Overall water quality is declining over recent sampling years. The lake supports 6 documented fish species including black bullhead, black crappie, and bluegill. No public access — the lake is private or restricted. Compared to the 43 other monitored lakes in Ramsey County, Loeb Lake ranks #14 for water quality.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-10-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Grade onlyModerate
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.
Generally safe for swimming, moderate water quality
Water Quality Grade: C (Fair)
Good clarity, visible to about 11.2 ft. Phosphorus level: 29 µg/L. Chlorophyll-a: 4 µg/L. Trophic State Index: 46.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.2 ft | Not graded |
| Phosphorus | 29 µg/L | Fair |
| Chlorophyll-a (Algae) | 4 µg/L | Good |
| Trophic State Index (TSI) | 46 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Loeb Lake
Compare lakeside cabins, hotels, and vacation rentals near Loeb Lake in Ramsey 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
Loeb Lake typically sits around 63°F at the surface in August. Summer average is about 60°F. Usually warmest in Aug (about 63°F) and coldest in Mar (about 40°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 738 field readings (2010–2025) via the EPA Water Quality Portal. See the full Loeb Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 28 ft |
| Surface Area | 9 acres |
| Shoreline Length | 0.5 mi |
| Littoral Zone | 89% |
| Public Access | No |
Fish Species
Click a species to see every graded lake where it is documented.
Fishing Loeb 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.
DNR Fisheries Survey Summary
7 surveys on file from MN DNR Fisheries. Most recent: 2024-07-21 (Standard Survey).
Top Species by Catch Rate
| Species | Avg CPUE | Avg Weight |
|---|---|---|
| Bluegill | 26.18 | 0.11 lb |
| Black Bullhead | 8.53 | 0.3 lb |
| Brown Bullhead | 8.50 | 0.24 lb |
| Black Crappie | 5.26 | 0.12 lb |
| Walleye | 4.52 | 1.44 lb |
| Pumpkinseed | 3.99 | 0.09 lb |
CPUE = catch per unit effort, averaged across surveys (excludes juvenile shoreline seining). Higher CPUE = more abundant in standardized sampling.
Length Distributions
Number of fish caught at each inch class in the most recent survey that recorded lengths. Red dashed line marks an approximate trophy threshold for that species.
Bluegill
Black Bullhead
Black Crappie
Walleye
From the 2024-07-21 survey
Loeb Lake is a small 8.5-acre (7.6 littoral acre), class 30 lake located entirely within Marydale Park in the City of St. Paul. There is on-street parking, a walking path around the lake, a playground, and picnic tables/grills. The lake is rather deep for its size, with a maximum depth of 28 feet. The water is clear…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Loeb Lake. 2 reports on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — LoebFisheries Lake Survey · MN DNR LakeFinder
- —Fish Stocking History — LoebFish Stocking History · MN DNR LakeFinder
Water Quality Trend: ↓ Declining
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.171 m/yr | 6 |
| Phosphorus | ↓ Declining | +5.67 µg/L/yr | 6 |
| Chlorophyll-a | ↓ Declining | +1.47 µg/L/yr | 6 |
EPA Impairment Status
Loeb 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 MN62-0055-00 · Official waterbody report · Matched by proximity (1.42 km)
Regulated Pollution Sources Nearby
3 EPA-permitted facilities operate within about 5 miles of Loeb Lake under Clean Water Act (NPDES) discharge permits.
- Viking Gas TransmissionSaint Paul · 1.1 mi away · NPDES MN0060755
- Nea Galtier LlcSaint Paul, City Of · 2.5 mi away · NPDES MN0062031
- Metropolitan CouncilSaint Paul · 2.5 mi away · NPDES MN0070131
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.
County Ranking
Ranked #14 of 44 lakes in Ramsey County
Nearby Lakes in Ramsey County
Frequently asked questions about Loeb Lake
What is the water quality grade for Loeb Lake?
- Loeb Lake in Ramsey County, Minnesota has a water quality grade of C (Fair). Water clarity: 11.2 ft visibility. Phosphorus: 29 µg/L. Chlorophyll-a (algae): 4 µg/L. Maximum depth: 28 ft. Surface area: 8.52 acres.
Is Loeb Lake safe to swim in?
- Generally safe for swimming, moderate water quality. Loeb Lake has a water quality grade of C (Fair). Algae concentration (chlorophyll-a) is 4 µg/L. Always check local health department advisories before swimming.
What is the water temperature of Loeb Lake?
- Loeb Lake typically sits around 63°F at the surface in August, from 738 EPA Water Quality Portal field readings (2010–2025). That is a typical value for the month, not a live reading.
How deep is Loeb Lake?
- Loeb Lake has a maximum depth of 28 feet. The lake covers 8.52 acres.
What fish are in Loeb Lake?
- Fish species found in Loeb Lake include black bullhead, black crappie, bluegill, green sunfish, hybrid sunfish, yellow bullhead. Loeb Lake is located in Ramsey County, Minnesota.
Explore Loeb Lake across LakeGrade
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Moderate nutrients, good water quality
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Where this data comes from
780 measurements from 1 monitoring station, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA780 samples · 2020–2025
Analytical methods
- Field measurement/observation, generic method
- Phosphorus by Colorimetry
- Phosphorus by Two Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- 2130 B ~ Nephelometric Method
- Turbidity by Nephelometry
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 details from Minnesota DNR LakeFinder