Timberline Lakes
St. Francois County, WisconsinOligotrophic
Timberline Lakes is a 42-acre cold, clear oligotrophic lake in St. Francois County, MO. Water quality is graded A based on 3 sampling years through 2024. Compared to the 3 other monitored lakes in St. Francois County, Timberline Lakes ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-21. Grade methodology: LakeGrade methodology.
Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 14.3 ft. Phosphorus level: 5.5 µg/L. Chlorophyll-a: 1.6 µg/L. Trophic State Index: 34.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 14.3 ft | B |
| Phosphorus | 5.5 µg/L | A |
| Chlorophyll-a (Algae) | 1.6 µg/L | A |
| Trophic State Index (TSI) | 34 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 42 acres |
Location
County Ranking
Ranked #3 of 4 lakes in St. Francois County
Nearby Lakes in St. Francois County
More Wisconsin Lake Rankings
Other Grade A Lakes in Wisconsin
Jefferson County · Clarity: 12.9 ft
Washington County · Clarity: 11.1 ft
Warren County · Clarity: 12.6 ft
Taney County · Clarity: 13.3 ft
Taney County · Clarity: 12.6 ft
Iron County · Clarity: 13.1 ft
Oligotrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Timberline Lakes is a man-made reservoir impounded by the Lake Timberline Dam (completed 1963), built primarily for recreation on the BEE RUN CREEK; earth-type dam, 79 ft tall and 760 ft long.
- Surface area
- 42 ac
- Normal storage
- 1,083 ac-ft
- Max storage
- 1,464 ac-ft
- Drainage area
- 1.95 sq mi
- Hazard class
- High
- Owner
- LAKE TIMBERLINE BOARD OF TRUST
Source: USACE National Inventory of Dams, NID ID MO30156 · Operator website · Matched by proximity (0.06 km)
EPA Impairment Status
Timberline Lakes is officially listed as impaired under Clean Water Act §303(d) in the 2022 EPA reporting cycle (IR category 5).
Causes of impairment
Source: EPA ATTAINS assessment unit MO_7304.00 · Official waterbody report · Matched by proximity (0.47 km)
Data Sources
Water quality data from the EPA Water Quality Portal
Impairment status from EPA ATTAINS 303(d) database
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-21
Monitoring stations: 1