Glen Lake
Lincoln County, Montana300 acresView mapDirections
Montana DEQ publishes the water-quality measurements for Glen Lake. Here is what has been measured.
- Public access
- Limited data
Glen Lake in Lincoln County, Montana has water-quality measurements published by Montana DEQ, shown here as reported. Water clarity: 19.9 ft visibility. Surface area: 300 acres.
Glen Lake is a 300-acre lake in Lincoln County, Montana. Overall water quality is declining over recent sampling years. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, Montana DEQ, last sampled 2023-07-24. Methodology: how these readings are compared.
What Glen Lake is good for
From access and monitoring records, not editorial picks.
- Clear water19.9 ft of visibility
- Boat launch1 documented ramp
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Glen Lake is safe to swim in today is a call for the Montana Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Glen Lake
These are the measurements Montana DEQ publishes for Glen Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Crystal clear, you can see 19.9 ft down. TSI 34.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 19.9ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | No reading The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. | |
| Chlorophyll-a (algae) | No reading The green pigment in algae — a direct measure of how much algae is in the water. | |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 34 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
Ask about Glen Lake
Answers come straight from the public measurements and survey records on this page.
Lake Details
Surface area
300 acres
Public access
Yes
Listed by Montana DEQ
No bathymetric survey has been published for Glen Lake, so its depth is not documented here.
Recreation & Access
- Glen LakePublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Stays near Glen Lake
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Fishing Glen Lake
Water Quality Trend: Worsening
Based on 12 years of monitoring (2012–2023).
Water clarity
Worsening3 years
Phosphorus
Worsening+0.21 µg/L/yr11 years
Chlorophyll-a
Improving-0.05 µg/L/yr12 years
Reservoir Info (USACE NID)
Glen Lake is a man-made reservoir impounded by the Glen Lake (completed 1950), built primarily for irrigation on the Lick Creek; earth-type dam, 14 ft tall and 700 ft long.
- Surface area
- 300 ac
- Normal storage
- 2,660 ac-ft
- Max storage
- 3,580 ac-ft
- Hazard class
- High
- Owner
- GLEN LAKE IRRIGATION DISTRICT
Source: USACE National Inventory of Dams, NID ID MT03756 · Operator website
Nearby Lakes in Lincoln County
Frequently asked questions about Glen Lake
Where is Glen Lake?
- Glen Lake is a lake in Lincoln County, Montana. Its water-quality measurements are published by Montana DEQ and shown on this page as reported.
What is the water quality of Glen Lake?
- Glen Lake in Lincoln County, Montana has water-quality measurements published by Montana DEQ, shown here as reported. Water clarity: 19.9 ft visibility. Surface area: 300 acres.
Is Glen Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Glen Lake?
- Glen Lake has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Glen Lake. Public access is listed as yes.
Can I fish at Glen Lake?
- Glen 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 Montana's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
10 measurements from 1 monitoring station, 2020–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS10 samples · 2020–2023
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
Named boat-access points from the USGS National Boat Ramps inventory