Ririe Reservoir
Bonneville County, Idaho1,560 acresView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Public access
- Limited data
Ririe Reservoir in Bonneville County, Idaho is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 19 µg/L. Chlorophyll-a (algae): 3.2 µg/L. Surface area: 1560 acres.
- Area
- 1,560 acres
- Phosphorus
- 19 µg/L
- Chlorophyll-a
- 3.2 µg/L
- Public access
- Yes
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Watch Ririe Reservoir’s letter
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Why Ririe Reservoir has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Ririe Reservoir, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus and algae (chlorophyll-a), but not water clarity.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by IDEQ and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Ririe Reservoir is a 1,560-acre lake in Bonneville County, Idaho. Limited fish-species data available. Public access is available with 1 public boat landing.
Source: EPA Water Quality Portal sampling records, IDEQ, last sampled 2024-09-17. Grade methodology: LakeQuality methodology.
What Ririe Reservoir is good for
From access and monitoring records, not editorial picks.
- Boat launch1 documented ramp
- Big water1,560 acres
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Ririe Reservoir
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 19 µg/L. Chlorophyll-a 3.2 µg/L. TSI 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 19 µg/L | Not graded |
| Chlorophyll-a (Algae) | 3.2 µg/L | Not graded |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 1,560 acres |
| Public Access | Yes |
No bathymetric survey has been published for Ririe Reservoir, so its depth is not documented here.
Recreation & Access
- Juniper ParkPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Ririe Reservoir
Reservoir Info (USACE NID)
Ririe Reservoir is a man-made reservoir impounded by the Ririe Dam (completed 1977), built primarily for flood risk reduction on the Willow Creek; rockfill-type dam, 253 ft tall and 1,070 ft long.
- Surface area
- 1,560 ac
- Normal storage
- 90,500 ac-ft
- Max storage
- 100,500 ac-ft
- Drainage area
- 638.06 sq mi
- Hazard class
- High
- Owner
- BUREAU OF RECLAMATION
All listed purposes: Flood Risk Reduction;Irrigation;Recreation.
Source: USACE National Inventory of Dams, NID ID ID00344 · Operator website
Graded lakes near Ririe Reservoir
Ririe Reservoir has no grade, but these lakes within a short drive do.
Nearby Lakes in Bonneville County
Frequently asked questions about Ririe Reservoir
Where is Ririe Reservoir?
- Ririe Reservoir is a lake in Bonneville County, Idaho. 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 Ririe Reservoir?
- Ririe Reservoir in Bonneville County, Idaho is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 19 µg/L. Chlorophyll-a (algae): 3.2 µg/L. Surface area: 1560 acres.
Is Ririe Reservoir safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Ririe Reservoir?
- Ririe Reservoir has 1 documented boat landing in the USGS National Boat Ramps inventory. Named access points include Juniper Park. Public access is listed as yes.
Explore Ririe Reservoir across LakeQuality
20.3 mi away · 60 ft
4 thermal springs within 21.1 mi, nearest Heise Hot Springs
17.4 mi away · cable-pulled, no boat wake
Species activity outlook by water temperature and season
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Where this data comes from
5 measurements from 1 monitoring station, 2023–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Bureau of Reclamation
1119USBR_WQX5 samples · 2023–2024
Analytical methods
- Phosphorus by Single Reagent Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Turbidity by Nephelometry
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