Fremont Bridge Lake
Klamath County, Oregon85,000 acresView mapDirections
Nutrients and algae run above the regional average.
↑ up from F at the last regrade
- Hypereutrophic
- #9 of 17 in the county
- Public access
Fremont Bridge Lake in Klamath County, Oregon has a water quality grade of D (Nutrient-rich). Phosphorus: 200 µg/L. Surface area: 85000 acres.
- Area
- 85,000 acres
- Type
- Hypereutrophic
- Phosphorus
- 200 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Stays near Fremont Bridge Lake
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Watch Fremont Bridge Lake’s letter
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Fremont Bridge Lake is a 85,000-acre highly nutrient-loaded hypereutrophic lake in Klamath County, Oregon. Water quality is graded D based on 1 sampling years through 2024. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 5 public boat landings. Compared to the 16 other monitored lakes in Klamath County, Fremont Bridge Lake ranks #9 for water quality.
Source: EPA Water Quality Portal sampling records, Oregon DEQ, last sampled 2024-03-04. Grade methodology: LakeQuality methodology.
What Fremont Bridge Lake is good for
From access and monitoring records, not editorial picks.
- Boat launch5 documented ramps
- Big water85,000 acres
Swimming Safety
Grade onlyElevated nutrients
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 D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: D (Nutrient-rich)
No clarity data. Phosphorus 200 µg/L. TSI 81. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 200 µg/L | Poor |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 81 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 85,000 acres |
| Public Access | Yes |
No bathymetric survey has been published for Fremont Bridge Lake, so its depth is not documented here.
Recreation & Access
- Miller IslandPublic
- Veteran's Memorial ParkPublic
- Moore Park Marina #2Public
- Moore Park Marina #1Public
- Pelican MarinaSemi-private
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Fremont Bridge Lake
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -42.5 µg/L/yr | 4 |
Reservoir Info (USACE NID)
Fremont Bridge Lake is a man-made reservoir impounded by the Link River Diversion Dam (completed 1921), built primarily for hydroelectric on the Klamath River, Link River; concrete-type dam, 22 ft tall and 435 ft long.
- Surface area
- 85,000 ac
- Normal storage
- 735,000 ac-ft
- Max storage
- 735,000 ac-ft
- Drainage area
- 3,800 sq mi
- Hazard class
- High
- Owner
- BUREAU OF RECLAMATION
All listed purposes: Hydroelectric;Irrigation;Recreation.
Source: USACE National Inventory of Dams, NID ID OR00557 · Operator website · Matched by proximity (0.64 km)
County Ranking
Ranked #9 of 17 lakes in Klamath County
Nearby Lakes in Klamath County
Frequently asked questions about Fremont Bridge Lake
Where is Fremont Bridge Lake?
- Fremont Bridge Lake is a lake in Klamath County, Oregon. LakeQuality grades it D for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Fremont Bridge Lake?
- Fremont Bridge Lake in Klamath County, Oregon has a water quality grade of D (Nutrient-rich). Phosphorus: 200 µg/L. Surface area: 85000 acres.
Is Fremont Bridge Lake safe to swim in?
- The D is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Fremont Bridge Lake?
- Fremont Bridge Lake has 5 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Miller Island, Veteran's Memorial Park, Moore Park Marina #2, Moore Park Marina #1, among others. Public access is listed as yes.
Explore Fremont Bridge Lake across LakeQuality
4 thermal springs within 10.7 mi, nearest Hardboard Spring
Species activity outlook by water temperature and season
Where to stay at Oregon's top lakes, each with its grade
Very high nutrients, dense algae, poor clarity
Oregon's cleanest and most-polluted lakes, ranked
More Oregon Lake Rankings
Other Grade D Lakes in Oregon
Hypereutrophic Lakes in Oregon
Where this data comes from
395 measurements from 1 monitoring station, 2020–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Oregon Water Science Center
USGS-OR395 samples · 2020–2024
Analytical methods
- Nutrients, wu, WCA,persulfate,CF
- YSI EXO turbidity sensor, FNU
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
Named boat-access points from the USGS National Boat Ramps inventory