Pasisades Reservoir
Bonneville County, IdahoView mapDirections
Idaho DEQ publishes the water-quality measurements for Pasisades Reservoir. Here is what has been measured.
- Mesotrophic
- Public access
- Limited data
Pasisades Reservoir in Bonneville County, Idaho has water-quality measurements published by Idaho DEQ, shown here as reported. Water clarity: 10.5 ft visibility. Phosphorus: 15 µg/L. Chlorophyll-a (algae): 2.9 µg/L.
Pasisades Reservoir is a mesotrophic lake in Bonneville County, Idaho. Water clarity is declining 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 Bonneville County, Pasisades Reservoir ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, IDEQ, last sampled 2023-06-29. Methodology: how these readings are compared.
What Pasisades Reservoir is good for
From access and monitoring records, not editorial picks.
- Clear water10.5 ft of visibility
- Boat launch1 documented ramp
Swimming conditions
Readings onlyLimited data
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 Pasisades Reservoir is safe to swim in today is a call for the Idaho Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Pasisades Reservoir
These are the measurements Idaho DEQ publishes for Pasisades Reservoir, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Good clarity, visible to about 10.5 ft. Phosphorus 15 µg/L. Chlorophyll-a 2.9 µg/L. TSI 42.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 10.5ft | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 15µg/L | Good GoodFairPoor |
| Chlorophyll-a (algae) | 2.9µg/L | Fair GoodFairPoor |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 42 | Mesotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Moderate nutrients, good water quality
Ask about Pasisades Reservoir
Answers come straight from the public measurements and survey records on this page.
Recreation & Access
- Blowout CanyonPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
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Fishing Pasisades Reservoir
Water Quality Trend: Stable
Based on 13 years of monitoring (2012–2024).
Water clarity
Worsening13 years
Phosphorus
Improving-1.41 µg/L/yr13 years
Chlorophyll-a
Stable+0.03 µg/L/yr12 years
Nearby Lakes in Bonneville County
Frequently asked questions about Pasisades Reservoir
Where is Pasisades Reservoir?
- Pasisades Reservoir is a lake in Bonneville County, Idaho. Its water-quality measurements are published by Idaho DEQ and shown on this page as reported.
What is the water quality of Pasisades Reservoir?
- Pasisades Reservoir in Bonneville County, Idaho has water-quality measurements published by Idaho DEQ, shown here as reported. Water clarity: 10.5 ft visibility. Phosphorus: 15 µg/L. Chlorophyll-a (algae): 2.9 µg/L.
Is Pasisades Reservoir safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Pasisades Reservoir?
- Pasisades Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Blowout Canyon. Public access is listed as yes.
Can I fish at Pasisades Reservoir?
- Pasisades Reservoir 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 Idaho's fish and wildlife agency, so check its current regulations before you go.
Explore Pasisades Reservoir across LakeQuality
12.5 mi away · 60 ft
4 thermal springs within 20.3 mi, nearest Alpine Warm Spring
Species activity outlook by water temperature and season
Where to stay at Idaho's top lakes, each with its readings
Idaho's cleanest lakes, ranked on agency measurements
More lakes in Idaho
Other Lakes in Idaho
Mesotrophic Lakes in Idaho
Where this data comes from
20 measurements from 1 monitoring station, 2013–2023. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Bureau of Reclamation
1119USBR_WQX20 samples · 2013–2023
Analytical methods
- Depth, Secchi disk depth
- Zebra/Quagga Mussel APHA 10200G Modified
- Phosphorus by Single Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidity by Nephelometry
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