Jamestown Reservoir
Stutsman County, WisconsinEutrophic
Jamestown Reservoir is a 17,427-acre productive, nutrient-rich eutrophic lake in Stutsman County, ND. Water quality is graded D based on 3 sampling years through 2023. Compared to the 6 other monitored lakes in Stutsman County, Jamestown Reservoir ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, local state DNR records, last sampled 2023-07-26. Grade methodology: LakeGrade methodology.
Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 6 ft. Phosphorus level: 560.5 µg/L. Chlorophyll-a: 17.6 µg/L. Trophic State Index: 69.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6 ft | D |
| Phosphorus | 560.5 µg/L | F |
| Chlorophyll-a (Algae) | 17.6 µg/L | C |
| Trophic State Index (TSI) | 69 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 17.4K acres |
Location
County Ranking
Ranked #6 of 7 lakes in Stutsman County
Cleaner Lakes Within 30 Miles
Jamestown Reservoir holds Grade D. 5 nearby lakes hold higher grades.
- ASpiritwood LakeStutsman County · 11.5 mi · Two grade letters higher (D → A)
- BJamestown ReservoirStutsman County · 3.2 mi · Two grade letters higher (D → B)
- CMoon LakeBarnes County · 26.4 mi · Higher grade (D → C)
- CBader LakeStutsman County · 27.9 mi · Higher grade (D → C)
- CHehn-Schaffer LakeStutsman County · 26.4 mi · Higher grade (D → C)
Nearby Lakes in Stutsman County
More Wisconsin Lake Rankings
Other Grade D Lakes in Wisconsin
Eutrophic Lakes in Wisconsin
Reservoir Info (USACE NID)
Jamestown Reservoir is a man-made reservoir impounded by the Jamestown Dam (completed 1954), built primarily for flood risk reduction on the JAMES RIVER; earth-type dam, 110 ft tall and 1,418 ft long.
- Surface area
- 17,427 ac
- Normal storage
- 35,535 ac-ft
- Max storage
- 379,636 ac-ft
- Drainage area
- 1,573.65 sq mi
- Hazard class
- High
- Owner
- BUREAU OF RECLAMATION
All listed purposes: Flood Risk Reduction;Irrigation.
Source: USACE National Inventory of Dams, NID ID ND00151 · Operator website
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-07-26
Monitoring stations: 1