Happy Holler Lake
Andrew County, WisconsinEutrophic
Happy Holler Lake is a 62-acre productive, nutrient-rich eutrophic lake in Andrew County, MO. Water quality is graded C based on 2 sampling years through 2024.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-07-29. Grade methodology: LakeGrade methodology.
Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
No clarity data. Phosphorus level: 63 µg/L. Chlorophyll-a: 12.7 µg/L. Trophic State Index: 60.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 63 µg/L | D |
| Chlorophyll-a (Algae) | 12.7 µg/L | C |
| Trophic State Index (TSI) | 60 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 62 acres |
Location
County Ranking
Ranked #1 of 1 lakes in Andrew County
Cleaner Lakes Within 30 Miles
Happy Holler Lake holds Grade C. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Andrew County
More Wisconsin Lake Rankings
Other Grade C Lakes in Wisconsin
Warren County · Clarity: 3.8 ft
Ralls County · Clarity: 3.7 ft
Warren County · Clarity: 3.3 ft
Platte County · Clarity: 4.7 ft
Barry County · Clarity: 5 ft
Phelps County · Clarity: 4.9 ft
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Happy Holler Lake is a man-made reservoir impounded by the Happy Holler Dam (completed 1995), built primarily for recreation on the PLATTE RIVER; earth-type dam, 43 ft tall and 843 ft long.
- Surface area
- 62 ac
- Normal storage
- 805 ac-ft
- Max storage
- 805 ac-ft
- Drainage area
- 3.41 sq mi
- Hazard class
- High
- Owner
- MO DEPT OF CONSERVATION
All listed purposes: Recreation;Fish and Wildlife Pond.
Source: USACE National Inventory of Dams, NID ID MO12380 · Operator website
EPA Impairment Status
Happy Holler Lake 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_7644.00 · Official waterbody report
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: 2024-07-29
Monitoring stations: 1