Reservoir · Montana · United States · USACE CWMS
Tiber Dam & Reservoir
91.8% full
Capacity
1,193.17 hm³
Volume stored
1096 hm³
Coordinates
48.320°N, 111.102°W
Last updated
2026-07-29
Current fill
91.8%vs 7 days ago
-0.2%losing
vs 1 year ago
-1.6%year-over-year
7-day trend
→stable
Data source: USACE CWMS — US Army Corps of Engineers — 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: 2026-07-29.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 48.320, -111.102 · Open in Google Maps
About Tiber Dam & Reservoir
As of July 29, 2026, Tiber Dam & Reservoir is filled to 91.8% of its total capacity, holding roughly 1,096 hm³ of water out of a maximum 1,193 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.2 pts), and it is 1.6 points below its level on the same date a year earlier.
Across the readings we hold for Tiber Dam & Reservoir — 1821 data points between July 31, 2021 and July 29, 2026 — the level has ranged from a low of 70.3% (February 21, 2025) to a high of 96.4% (July 6, 2026). On average the reservoir is fullest around July and at its lowest around March.
It is operated by USACE primarily for multiple purposes. It lies within the Montana basin at 48.320°N, 111.102°W.
Key facts
- Current fill level
- 91.8%
- Water stored
- 1,096 hm³
- Total capacity
- 1,193 hm³
- 7-day change
- ▼ 0.2 pts
- Year-on-year
- ▼ 1.6 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- USACE
- Coordinates
- 48.320°N, 111.102°W
- Last updated
- July 29, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 29 Jul 2026 | 91.8% | 1,096 |
| 28 Jul 2026 | 92.0% | 1,098 |
| 27 Jul 2026 | 92.3% | 1,101 |
| 26 Jul 2026 | 92.7% | 1,106 |
| 25 Jul 2026 | 93.0% | 1,109 |
| 24 Jul 2026 | 93.3% | 1,113 |
| 23 Jul 2026 | 93.6% | 1,117 |
| 22 Jul 2026 | 93.7% | 1,118 |
| 21 Jul 2026 | 94.1% | 1,123 |
| 20 Jul 2026 | 94.1% | 1,123 |
| 19 Jul 2026 | 94.3% | 1,125 |
| 18 Jul 2026 | 94.5% | 1,128 |
Frequently asked questions
What is the current water level of Tiber Dam & Reservoir?
As of July 29, 2026, Tiber Dam & Reservoir is at 91.8% of its capacity, holding approximately 1,096 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Tiber Dam & Reservoir reservoir full?
No. As of July 29, 2026, Tiber Dam & Reservoir is high at 91.8% of its capacity, so it is not full.
Is the water level at Tiber Dam & Reservoir rising or falling?
The level at Tiber Dam & Reservoir has been broadly stable over the latest week on record (-0.2 points).
How much water can Tiber Dam & Reservoir hold?
Tiber Dam & Reservoir has a total capacity of 1,193 hm³.
Where is Tiber Dam & Reservoir reservoir located?
Tiber Dam & Reservoir is located in Montana, United States, within the Montana basin (coordinates 48.320°N, 111.102°W).
What is Tiber Dam & Reservoir used for?
Tiber Dam & Reservoir is used primarily for multiple purposes, and is managed by USACE.