Epping-Springbrook Dam-Deepest Lake
Williams County, North Dakota148 acresView mapDirections
ND DEQ publishes the water-quality measurements for Epping-Springbrook Dam-Deepest Lake. Here is what has been measured.
- Eutrophic
- Public access
Epping-Springbrook Dam-Deepest Lake in Williams County, North Dakota has water-quality measurements published by ND DEQ, shown here as reported. Water clarity: 4.9 ft visibility. Phosphorus: 689.5 µg/L. Chlorophyll-a (algae): 20.4 µg/L. Surface area: 148 acres.
Epping-Springbrook Dam-Deepest Lake is a 148-acre productive, nutrient-rich eutrophic lake in Williams County, North Dakota. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing. Compared to the 5 other monitored lakes in Williams County, Epping-Springbrook Dam-Deepest Lake ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2025-10-28. Methodology: how these readings are compared.
What Epping-Springbrook Dam-Deepest Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming conditions
Readings onlyAlgae risk
Based on clarity and algae readings from past sampling — there is no live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Epping-Springbrook Dam-Deepest Lake is safe to swim in today is a call for the North Dakota Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Epping-Springbrook Dam-Deepest Lake
These are the measurements ND DEQ publishes for Epping-Springbrook Dam-Deepest Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.9 ft. Phosphorus 689.5 µg/L. Chlorophyll-a 20.4 µg/L. TSI 71.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 4.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 690µg/L | Poor GoodFairPoor |
| Chlorophyll-a (algae) | 20.4µg/L | Poor GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 71 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Epping-Springbrook Dam-Deepest Lake
Answers come straight from the public measurements and survey records on this page.
Water Temperature
Epping-Springbrook Dam-Deepest Lake typically sits around 45°F at the surface in October. Summer average is about 65°F. Usually warmest in Aug (about 66°F) and coldest in Oct (about 45°F). These are typical values by month — not a live reading.
Column height runs from this lake’s coldest month (45°F) to its warmest (66°F).
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 →
Lake Details
Surface area
148 acres
Public access
Yes
Listed by ND DEQ
No bathymetric survey has been published for Epping-Springbrook Dam-Deepest Lake, so its depth is not documented here.
Recreation & Access
- Epping-Springbrook DamPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Stays via Stay22
Stays 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. The water-quality readings cover nutrients and algae, not lodging. Cabins and rentals around Epping-Springbrook Dam-Deepest Lake are listed below.
Top-rated places to stay near Epping-Springbrook Dam-Deepest Lake
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
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Fishing Epping-Springbrook Dam-Deepest Lake
Water quality readings over time
3 seasons of samples on record (2023–2025). Calling a direction takes at least 4 years of the same measurement.
Water clarity
Improving3 years
Phosphorus
Improving-435 µg/L/yr2 years
Chlorophyll-a
Improving-17.8 µg/L/yr2 years
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)
Nearby Lakes in Williams County
Frequently asked questions about Epping-Springbrook Dam-Deepest Lake
Where is Epping-Springbrook Dam-Deepest Lake?
- Epping-Springbrook Dam-Deepest Lake is a lake in Williams County, North Dakota. Its water-quality measurements are published by ND DEQ and shown on this page as reported.
What is the water quality of Epping-Springbrook Dam-Deepest Lake?
- Epping-Springbrook Dam-Deepest Lake in Williams County, North Dakota has water-quality measurements published by ND DEQ, shown here as reported. Water clarity: 4.9 ft visibility. Phosphorus: 689.5 µg/L. Chlorophyll-a (algae): 20.4 µg/L. Surface area: 148 acres.
Is Epping-Springbrook Dam-Deepest Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Epping-Springbrook Dam-Deepest Lake?
- Epping-Springbrook Dam-Deepest Lake typically sits around 45°F at the surface in October, from 82 EPA Water Quality Portal field readings (2011–2025). That is a typical value for the month, not a live reading.
Are there boat ramps on Epping-Springbrook Dam-Deepest Lake?
- Epping-Springbrook Dam-Deepest Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Epping-Springbrook Dam. Public access is listed as yes.
Can I fish at Epping-Springbrook Dam-Deepest Lake?
- Epping-Springbrook Dam-Deepest Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Seasons, size and bag limits, and whether you need a license are set by North Dakota's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
177 measurements from 1 monitoring station, 2023–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Dakota Department Of Environmental Quality
21NDHDWQ_WQX177 samples · 2023–2025
Analytical methods
- Phosphorus by Colorimetry
- 447.0 ~ EPA; Chlorophyll a and b in phytoplankton by HPLC/UV
- 4500 NO3 E ~ Nitrate in Water- Cadmium Reduction
Monitoring station identifiers (1)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.
Other records on this page
Depth, fish, and access data from North Dakota Game & Fish
Named boat-access points from the USGS National Boat Ramps inventory