Falk Lake
Burnett County, WisconsinLimited DataMesotrophic
On the LakeGrade scale Falk Lake grades a B, with clarity at 10.0 ft and phosphorus readings still being added placing it above the Wisconsin median.
Mesotrophic conditions dominate at Falk Lake: enough nutrients for a healthy fishery, not so much that algal blooms become a chronic problem. A maximum depth of 30 ft puts Falk Lake in the middle of Wisconsin's depth distribution. The lake is compact at 76 acres, with partial shoreline records and little volume to buffer nutrient inputs. Within Burnett County's 57 graded lakes, Falk Lake ranks 29 — below the local median, though not at the bottom.
An invasive species record — Chinese Mystery Snail — has been logged at Falk Lake; Wisconsin DNR maintains the official infested-waters list. The fishery includes walleye among the lake's 4 documented species — a notable draw for Wisconsin anglers. Monitoring depth is thin here: the LakeGrade rubric is applied to a small number of sample years, and the grade will be revised as more data accumulates.
Source: EPA Water Quality Portal sampling records, Wisconsin DNR Surface Water, last sampled 2025-10-04. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 10 ft. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 30 ft |
| Surface Area | 76 acres |
Fish Species
Click a species to see all Wisconsin and Minnesota lakes where it is found.
→ Best fishing times for Falk Lake (14-day solunar calendar)
→ Is it safe to eat fish from Falk Lake? (mercury & PFAS guide)
→ Falk Lake fishing regulations (limits, seasons, special rules)
Invasive & Introduced Species
Red chips are ecologically harmful invasive species. Gray chips are stocked or introduced fish that aren't a current ecological concern.
Water Quality Trend: → Stable
Based on 6 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | → Stable | -0.15 m/yr | 6 |
| Phosphorus | → Stable | +0.21 µg/L/yr | 6 |
Location
County Ranking
Ranked #29 of 57 lakes in Burnett County
Cleaner Lakes Within 30 Miles
Falk Lake holds Grade B. 3 nearby lakes hold higher grades.
Nearby Lakes in Burnett County
More Wisconsin Lake Rankings
Other Grade B Lakes in Wisconsin
Mesotrophic Lakes in Wisconsin
WI DNR Lake Profile
Authoritative data from the Wisconsin DNR LakePages. Monitored by volunteers since 1992. 1 station on file (most recent sample 2025).
Fish Species (DNR-rated)
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2025-10-04
Monitoring stations: 1