Epping-Springbrook Dam-Deepest Lake is a 148-acre productive, nutrient-rich eutrophic lake in Williams County, North Dakota with a maximum depth of 25 feet (10-foot average). Water quality is graded D based on 2 sampling years through 2025. Overall water quality is improving over recent sampling years. The lake supports 5 documented fish species including Northern Pike, Walleye, and Yellow Perch. Public access is available with 1 public boat landing. Compared to the 8 other monitored lakes in Williams County, Epping-Springbrook Dam-Deepest Lake ranks #8 for water quality.
Source: EPA Water Quality Portal sampling records, North Dakota DNR, last sampled 2025-10-28. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 4.9 ft. Chlorophyll-a: 21.3 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.9 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 21.3 µg/L | D |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | 25.4 ft |
| Average Depth | 9.5 ft |
| Surface Area | 148 acres |
| Shoreline Length | 6.2 mi |
| Public Access | Yes |
Where to stay near Epping-Springbrook Dam-Deepest Lake
Compare lakeside cabins, hotels, and vacation rentals near Epping-Springbrook Dam-Deepest Lake in Williams County, North Dakota — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fish Species
Click a species to see every graded lake where it is documented.
Fishing Epping-Springbrook Dam-Deepest Lake
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.35 m/yr | 3 |
| Chlorophyll-a | ↑ Improving | -17.8 µg/L/yr | 2 |
Recreation & Access
Water Temperature
Epping-Springbrook Dam-Deepest Lake averages about 65°F at the surface in summer, usually warmest in Aug (about 66°F) and coldest in Oct (about 45°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 82 field readings (2011–2025) via the EPA Water Quality Portal. See the full Epping-Springbrook Dam-Deepest Lake water temperature breakdown →
Location
County Ranking
Ranked #8 of 9 lakes in Williams County
Cleaner Lakes Within 30 Miles
Epping-Springbrook Dam-Deepest Lake holds Grade D. 4 nearby lakes hold higher grades.
- BKota Ray Dam LakeWilliams County · 13.3 mi · Two grade letters higher (D → B)
- BBlacktail Dam LakeWilliams County · 18.4 mi · Two grade letters higher (D → B)
- CTrenton LakeWilliams County · 22.8 mi · Higher grade (D → C)
- CMcleod ReservoirWilliams County · 13.2 mi · Higher grade (D → C)
Nearby Lakes in Williams County
Explore Epping-Springbrook Dam-Deepest Lake across LakeGrade
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Fish species and best lakes in Williams County
Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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Other Grade D Lakes in North Dakota
Eutrophic Lakes in North Dakota
More records, surveys & data sources
Reservoir Info (USACE NID)
Epping-Springbrook Dam-Deepest Lake is a man-made reservoir impounded by the Epping Dam (completed 1935), built primarily for recreation on the Stony Creek; earth-type dam, 56 ft tall and 1,000 ft long.
- Surface area
- 148 ac
- Normal storage
- 1,560 ac-ft
- Max storage
- 3,890 ac-ft
- Drainage area
- 72.9 sq mi
- Hazard class
- Significant
- Owner
- Williams County WRB
Source: USACE National Inventory of Dams, NID ID ND00249 · Operator website · Matched by proximity (0.17 km)
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth is a modeled estimate.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grading methodology based on Metropolitan Council standards
Depth, fish, and access data from North Dakota Game & Fish
Public boat-access points from the USGS National Boat Ramps inventory
Most recent sample: 2025-10-28
Monitoring stations: 1