Reservoir · Idaho · United States · BOR RISE
Lake Cascade
Lake Cascade and Cascade Dam
51.9% full
Capacity
855.05 hm³
Volume stored
444 hm³
Coordinates
44.525°N, 116.050°W
Last updated
2026-09-30
Current fill
51.9%vs 7 days ago
-0.4%losing
vs 1 year ago
-0.4%year-over-year
7-day trend
→stable
Data source: BOR RISE — US Bureau of Reclamation — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. Last reading: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.525, -116.050 · Open in Google Maps
About Lake Cascade
As of September 30, 2026, Lake Cascade is filled to 51.9% of its total capacity, holding roughly 444 hm³ of water out of a maximum 855 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (-0.4 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Lake Cascade — 2188 data points between October 2, 2021 and September 30, 2026 — the level has ranged from a low of 47.4% (October 2, 2021) to a high of 91.7% (June 10, 2024). On average the reservoir is fullest around June and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the Idaho basin at 44.525°N, 116.050°W.
Key facts
- Current fill level
- 51.9%
- Water stored
- 444 hm³
- Total capacity
- 855 hm³
- 7-day change
- ▼ 0.4 pts
- Year-on-year
- ▼ 0.4 pts
- Primary use
- Multipurpose
- River basin
- Idaho
- Operator
- BOR
- Coordinates
- 44.525°N, 116.050°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 51.9% | 444 |
| 29 Sep 2026 | 51.9% | 444 |
| 28 Sep 2026 | 52.0% | 445 |
| 27 Sep 2026 | 52.1% | 446 |
| 26 Sep 2026 | 52.2% | 446 |
| 25 Sep 2026 | 52.3% | 447 |
| 24 Sep 2026 | 52.3% | 447 |
| 23 Sep 2026 | 52.3% | 448 |
| 22 Sep 2026 | 52.4% | 448 |
| 21 Sep 2026 | 52.5% | 448 |
| 20 Sep 2026 | 52.5% | 449 |
| 19 Sep 2026 | 52.6% | 450 |