Beaver Lake
Logan County, North Dakota953 acresView mapDirections
Nutrients and algae sit mid-range for this region.
- Eutrophic
- Impaired · Nutrients (phosphorus, nitrogen)
- #1 of 1 in the county
- 26 ft max depth
- Public access
- Limited data
Beaver Lake in Logan County, North Dakota has a water quality grade of C (Fair). Water clarity: 1.4 ft visibility. Phosphorus: 112.5 µg/L. Chlorophyll-a (algae): 4.8 µg/L. Surface area: 953.1 acres.
- Clarity
- 1.4 ft
- Max depth
- ~26 ft est.
- Area
- 953 acres
- Type
- Eutrophic
- Phosphorus
- 112.5 µg/L
- Chlorophyll-a
- 4.8 µg/L
- Public access
- Yes
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Watch Beaver Lake’s letter
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Beaver Lake is a 953-acre productive, nutrient-rich eutrophic lake in Logan County, North Dakota with an estimated average depth of about 26 feet. Water quality is graded C based on 1 sampling years through 2024. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2024-10-01. Grade methodology: LakeQuality methodology.
What Beaver Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The C is nutrients and algae, not a swimming clearance. Beaver Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO), sediment / turbidity. Check local advisories before you swim.
Water Quality Grade: C (Fair)
Very murky, less than 1.4 ft of visibility. Phosphorus 112.5 µg/L. Chlorophyll-a 4.8 µg/L. TSI 63. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.4 ft | Not graded |
| Phosphorus | 112.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | 4.8 µg/L | Not graded |
| Trophic State Index (TSI) | 63 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Maximum Depth | ~26 ft est. |
| Average Depth | ~17 ft est. |
| Surface Area | 953 acres |
| Public Access | Yes |
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. North Dakota has not published bathymetry for Beaver Lake.
Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Recreation & Access
- Beaver LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Beaver Lake
Reservoir Info (USACE NID)
Beaver Lake is a man-made reservoir impounded by the Beaver Lake Dam (completed 1934), built primarily for recreation on the Beaver Creek; earth-type dam, 10 ft tall and 562 ft long.
- Surface area
- 953.1 ac
- Normal storage
- 5,319 ac-ft
- Max storage
- 5,319 ac-ft
- Drainage area
- 179 sq mi
- Hazard class
- Low
- Owner
- Logan County WRB
Source: USACE National Inventory of Dams, NID ID ND00368 · Operator website
EPA Impairment Status
Beaver 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 ND-10130104-001-L_00 · Official waterbody report
County Ranking
Ranked #1 of 1 lakes in Logan County
Nearby Lakes in Logan County
Frequently asked questions about Beaver Lake
Where is Beaver Lake?
- Beaver Lake is a lake in Logan County, North Dakota. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Beaver Lake?
- Beaver Lake in Logan County, North Dakota has a water quality grade of C (Fair). Water clarity: 1.4 ft visibility. Phosphorus: 112.5 µg/L. Chlorophyll-a (algae): 4.8 µg/L. Surface area: 953.1 acres.
Is Beaver Lake safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Beaver Lake is listed impaired under Clean Water Act §303(d) (IR 5) for nutrients (phosphorus, nitrogen), oxygen depletion (low DO), sediment / turbidity. Check local advisories before you swim.
How deep is Beaver Lake?
- No published bathymetric survey covers Beaver Lake, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 26 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate. The lake covers 953.1 acres.
Are there boat ramps on Beaver Lake?
- Beaver Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Beaver Lake. Public access is listed as yes.
Explore Beaver Lake across LakeQuality
Depth, room, public access, and the state wake-sport rules
Species activity outlook by water temperature and season
Where to stay at North Dakota's top lakes, each with its grade
High nutrients, frequent algae, reduced clarity
North Dakota's cleanest and most-polluted lakes, ranked
More North Dakota Lake Rankings
Other Grade C Lakes in North Dakota
Eutrophic Lakes in North Dakota
Where this data comes from
20 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Dakota Department Of Environmental Quality
21NDHDWQ_WQX20 samples · 2024
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)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database
Lake size & watershed from HydroLAKES (HydroSHEDS)
Depth, fish, and access data from North Dakota Game & Fish
Named boat-access points from the USGS National Boat Ramps inventory