Niagara Dam Lake
Grand Forks County, North Dakota16 acresView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Limited data
Niagara Dam Lake in Grand Forks County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1 ft visibility. Surface area: 16 acres.
- Clarity
- 1 ft
- Typical in September
- 60°F
- Area
- 16 acres
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Watch Niagara Dam Lake’s letter
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Why Niagara Dam Lake has no grade
Niagara Dam Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Niagara Dam Lake is Not Rated — not an F. Its 1-foot median from 8 readings collected 2025 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. Everything below that has been measured is still reported on this page.
Sampling is run by NDDEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Niagara Dam Lake is a 16-acre lake in Grand Forks County, North Dakota.
Source: EPA Water Quality Portal sampling records, NDDEQ, last sampled 2025-10-13. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Niagara Dam Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1 ft of visibility. TSI 77.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 77 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Water Temperature
Niagara Dam Lake typically sits around 60°F at the surface in September. Summer average is about 71°F. Usually warmest in Jul (about 73°F) and coldest in Oct (about 52°F). These are typical values by month — not a live reading.
Typical surface water temperature by month, from 15 field readings (2015–2025) via the EPA Water Quality Portal. See the full Niagara Dam Lake water temperature breakdown →
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 16 acres |
No bathymetric survey has been published for Niagara Dam Lake, so its depth is not documented here.
Fishing Niagara Dam Lake
Reservoir Info (USACE NID)
Niagara Dam Lake is a man-made reservoir impounded by the Niagra Township Dam 2 (completed 1935), built primarily for recreation on the North Branch Turtle River-TR; earth-type dam, 23 ft tall and 300 ft long.
- Surface area
- 16 ac
- Normal storage
- 120.8 ac-ft
- Max storage
- 243 ac-ft
- Drainage area
- 2.9 sq mi
- Hazard class
- Low
- Owner
- Grand Forks County WRB
Source: USACE National Inventory of Dams, NID ID ND00406 · Operator website · Matched by proximity (0.18 km)
Graded lakes near Niagara Dam Lake
Niagara Dam Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Grand Forks County
Frequently asked questions about Niagara Dam Lake
Where is Niagara Dam Lake?
- Niagara Dam Lake is a lake in Grand Forks County, North Dakota. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Niagara Dam Lake?
- Niagara Dam Lake in Grand Forks County, North Dakota is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1 ft visibility. Surface area: 16 acres.
Is Niagara Dam Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
What is the water temperature of Niagara Dam Lake?
- Niagara Dam Lake typically sits around 60°F at the surface in September, from 15 EPA Water Quality Portal field readings (2015–2025). That is a typical value for the month, not a live reading.
Explore Niagara Dam Lake across LakeQuality
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Where this data comes from
8 measurements from 1 monitoring station, 2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North Dakota Department Of Environmental Quality
21NDHDWQ_WQX8 samples · 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)
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
Depth, fish, and access data from North Dakota Game & Fish