Spearhead Lake
Hubbard County, Minnesota194 acresView mapDirections
Minnesota PCA publishes the water-quality measurements for Spearhead Lake. Here is what has been measured.
- 81 ft max depth
- Limited data
Spearhead Lake in Hubbard County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 15 ft visibility. Maximum depth: 81 ft. Surface area: 194.36 acres.
Minnesota DNR's Targeted Survey on August 8, 2023 caught 0.89 northern pike per trap net at Spearhead Lake. DNR survey details →
Spearhead Lake is a 194-acre lake in Hubbard County, Minnesota with a maximum depth of 81 feet. Overall water quality is declining over recent sampling years. The lake supports 17 documented fish species including black bullhead, black crappie, and bluegill. No public access — the lake is private or restricted.
Source: EPA Water Quality Portal sampling records, Minnesota DNR LakeFinder, last sampled 2025-10-29. Methodology: how these readings are compared.
What Spearhead Lake is good for
From access and monitoring records, not editorial picks.
- Clear water15 ft of visibility
- Fishing17 species recorded
- Ice seasonIce-out around Apr 15
- Deep water81 ft surveyed max depth
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Spearhead Lake is safe to swim in today is a call for the Minnesota Pollution Control Agency and the Minnesota DNR and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Spearhead Lake
These are the measurements Minnesota PCA publishes for Spearhead Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 15 ft down. TSI 38.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 15ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 38 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Spearhead Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Spearhead Lake typically sits around 56°F at the surface in October. Summer average is about 61°F. Usually warmest in Jun (about 66°F) and coldest in May (about 56°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (56°F) to its warmest (66°F).
Typical surface water temperature by month, from 179 field readings (2022–2025) via the EPA Water Quality Portal. See the full Spearhead Lake water temperature breakdown →
Minnesota DNR's Targeted Survey on August 8, 2023 caught 0.89 northern pike per trap net at Spearhead Lake.
A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Spearhead Lake’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
DNR Fisheries Survey Summary
8 surveys on file from MN DNR Fisheries. Most recent: 2025-07-31 (Targeted Survey).
8 surveys on file · most recent 2025-07-31 (Targeted Survey)
| Species | Catch rate (CPUE) | Size | Avg weight |
|---|---|---|---|
| Golden Shiner | 27.04 | 5 in 2022-05-31 | 0.05 lb |
| Green Sunfish | 16.75 | ||
| Tullibee (Cisco) | 14.03 | 2–16 in 2022-05-31 | 0.61 lb |
| Black Bullhead | 10.87 | 4–6 in 2022-05-31 | 0.15 lb |
CPUE = catch per unit effort, fish caught per net per set in a standardised survey. It measures abundance, not size, and is not a weekly bite report.
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.
Golden Shiner
Tullibee (Cisco)
Black Bullhead
From the 2025-07-31 survey
Temperature and dissolved oxygen measurements were collected from the deepest basin in Spearhead Lake on July 30th, 2025. This was done to evaluate the quantity and quality of cold, oxygenated water (i.e., oxythermal habitat) available to Cisco, also known as Tullibee, the most sensitive coldwater species present in…
DNR Reports & Resources
Minnesota DNR LakeFinder publishes lake survey, fish stocking, water access, and aquatic plant data for Spearhead Lake. 1 report on file.
These links open on the official state DNR websites (Wisconsin DNR survey PDFs · Minnesota DNR LakeFinder).
- —Fisheries Lake Survey — SpearheadFisheries Lake Survey · MN DNR LakeFinder
Lake Details
Max depth
81 ft
Surface area
194 acres
Shoreline
3.9 mi
Littoral zone
11%
Share shallower than 15 ft
Public access
No
Listed by Minnesota PCA
Lake Size & Watershed
Watershed (drainage) area
7 sq mi
HydroLAKES / HydroSHEDS
Elevation
1,348 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS).
Stays via Stay22
Stays near Spearhead Lake
Compare lakeside cabins, hotels, and vacation rentals near Spearhead Lake in Hubbard 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.
Top-rated places to stay near Spearhead Lake
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Follow Spearhead Lake’s readings
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Fish Species
Click a species to see every lake where it is documented.
Fishing Spearhead Lake
Water Quality Trend: Worsening
Based on 6 years of monitoring (2020–2025).
Water clarity
Worsening6 years
Ice season
Typical ice-out
Apr 15
Earliest Apr 9, 2005 · Latest May 7, 2022
Typical ice-in
Nov 24
Earliest Nov 15, 2002 · Latest Dec 8, 2021
Most recent ice-out
May 7
2022
7 observations · Minnesota PCA ice records
Nearby Lakes in Hubbard County
Frequently asked questions about Spearhead Lake
Where is Spearhead Lake?
- Spearhead Lake is a lake in Hubbard County, Minnesota. Its water-quality measurements are published by Minnesota PCA and shown on this page as reported.
What is the water quality of Spearhead Lake?
- Spearhead Lake in Hubbard County, Minnesota has water-quality measurements published by Minnesota PCA, shown here as reported. Water clarity: 15 ft visibility. Maximum depth: 81 ft. Surface area: 194.36 acres.
Is Spearhead Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Spearhead Lake?
- Spearhead Lake typically sits around 56°F at the surface in October, from 179 EPA Water Quality Portal field readings (2022–2025). That is a typical value for the month, not a live reading.
How deep is Spearhead Lake?
- Spearhead Lake has a maximum depth of 81 feet. The lake covers 194.36 acres.
What fish are in Spearhead Lake?
- Fish species found in Spearhead Lake include black bullhead, black crappie, bluegill, bowfin (dogfish), brown bullhead, green sunfish, hybrid sunfish, largemouth bass, northern pike, northern sunfish, pumpkinseed, rock bass, tullibee (cisco), walleye, white sucker, yellow bullhead, yellow perch. Spearhead Lake is located in Hubbard County, Minnesota.
What did the DNR fisheries survey find at Spearhead Lake?
- Minnesota DNR's Targeted Survey on August 8, 2023 caught 0.89 northern pike per trap net at Spearhead Lake. A DNR fisheries survey reports fish abundance and catch rates, not water quality. LakeQuality shows Spearhead Lake’s water-quality measurements separately, and the water-quality trend over 6 years of monitoring is declining. Catch rate is not a swim clearance and is not a weekly bite report.
When does Spearhead Lake thaw?
- Spearhead Lake typically has ice-out around Apr 15. Ice typically forms around Nov 24. The open water season is approximately 223 days.
Can I fish at Spearhead Lake?
- Public access to Spearhead Lake is listed as no on the lake record, so confirm before you make the trip. Seasons, size and bag limits, and whether you need a license are set by Minnesota's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
110 measurements from 3 monitoring stations, 2020–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Minnesota Pollution Control Agency - Ambient Surface Water
MNPCA109 samples · 2020–2025 - Minnesota Department of Agriculture - Pesticide Monitoring
MNDA_PESTICIDE1 sample · 2022
Analytical methods
- Field measurement/observation, generic method
Monitoring station identifiers (3)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)
Lake details from Minnesota DNR LakeFinder
Ice data from Minnesota DNR Climate