Viking Lake
Montgomery County, WisconsinEutrophic
Viking Lake is a 148-acre productive, nutrient-rich eutrophic lake in Montgomery County, IA. Water quality is graded F based on 2 sampling years through 2024.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2024-09-30. Grade methodology: LakeGrade methodology.
Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 3.3 ft of visibility. Chlorophyll-a: 32.7 µg/L. Trophic State Index: 62.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.3 ft | F |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 32.7 µg/L | F |
| Trophic State Index (TSI) | 62 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 148 acres |
Location
County Ranking
Ranked #1 of 1 lakes in Montgomery County
Cleaner Lakes Within 30 Miles
Viking Lake holds Grade F. 3 nearby lakes hold higher grades.
- CMormon Trail LakeAdair County · 27.6 mi · Two grade letters higher (F → C)
- DCold Springs LakeCass County · 22 mi · Higher grade (F → D)
- DBinder LakeAdams County · 16.8 mi · Higher grade (F → D)
Nearby Lakes in Montgomery County
More Wisconsin Lake Rankings
Other Grade F Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Viking Lake is a man-made reservoir impounded by the Viking Lake Dam (completed 1957), built primarily for recreation on the DUNNS CREEK; earth-type dam, 69 ft tall and 1,220 ft long.
- Surface area
- 148 ac
- Normal storage
- 1,900 ac-ft
- Max storage
- 3,450 ac-ft
- Drainage area
- 3.42 sq mi
- Hazard class
- Significant
- Owner
- Iowa Department of Natural Resources
Source: USACE National Inventory of Dams, NID ID IA01366 · Operator website
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-30
Monitoring stations: 1