Reservoir · Oregon · United States · BOR RISE
McKay Reservoir and Dam (MCK)
42.6% full
Capacity
83.63 hm³
Volume stored
36 hm³
Coordinates
45.605°N, 118.796°W
Last updated
2026-07-28
Current fill
42.6%vs 7 days ago
-0.3%losing
vs 1 year ago
-25.2%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: 2026-07-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 45.605, -118.796 · Open in Google Maps
About McKay Reservoir and Dam (MCK)
As of July 28, 2026, McKay Reservoir and Dam (MCK) is filled to 42.6% of its total capacity, holding roughly 36 hm³ of water out of a maximum 84 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 (-0.3 pts), and it is 25.2 points below its level on the same date a year earlier.
Across the readings we hold for McKay Reservoir and Dam (MCK) — 2189 data points between July 31, 2021 and July 28, 2026 — the level has ranged from a low of 8.0% (November 18, 2025) to a high of 99.6% (May 30, 2022). On average the reservoir is fullest around May and at its lowest around November.
It is operated by BOR primarily for multiple purposes. It lies within the Oregon basin at 45.605°N, 118.796°W.
Key facts
- Current fill level
- 42.6%
- Water stored
- 36 hm³
- Total capacity
- 84 hm³
- 7-day change
- ▼ 0.3 pts
- Year-on-year
- ▼ 25.2 pts
- Primary use
- Multipurpose
- River basin
- Oregon
- Operator
- BOR
- Coordinates
- 45.605°N, 118.796°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 42.6% | 36 |
| 27 Jul 2026 | 42.9% | 36 |
| 26 Jul 2026 | 43.3% | 36 |
| 25 Jul 2026 | 43.7% | 37 |
| 24 Jul 2026 | 44.1% | 37 |
| 23 Jul 2026 | 44.5% | 37 |
| 22 Jul 2026 | 44.9% | 38 |
| 21 Jul 2026 | 45.3% | 38 |
| 20 Jul 2026 | 45.7% | 38 |
| 19 Jul 2026 | 46.1% | 39 |
| 18 Jul 2026 | 46.5% | 39 |
| 17 Jul 2026 | 46.9% | 39 |
Frequently asked questions
What is the current water level of McKay Reservoir and Dam (MCK)?
As of July 28, 2026, McKay Reservoir and Dam (MCK) is at 42.6% of its capacity, holding approximately 36 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is McKay Reservoir and Dam (MCK) reservoir full?
No. As of July 28, 2026, McKay Reservoir and Dam (MCK) is within its normal operating range at 42.6% of its capacity, so it is not full.
Is the water level at McKay Reservoir and Dam (MCK) rising or falling?
The level at McKay Reservoir and Dam (MCK) has been broadly stable over the latest week on record (-0.3 points).
How much water can McKay Reservoir and Dam (MCK) hold?
McKay Reservoir and Dam (MCK) has a total capacity of 84 hm³.
Where is McKay Reservoir and Dam (MCK) reservoir located?
McKay Reservoir and Dam (MCK) is located in Oregon, United States, within the Oregon basin (coordinates 45.605°N, 118.796°W).
What is McKay Reservoir and Dam (MCK) used for?
McKay Reservoir and Dam (MCK) is used primarily for multiple purposes, and is managed by BOR.