Reservoir · Nebraska · United States · BOR RISE
Swanson Lake
Swanson Lake and Trenton Dam
37.7% full
Capacity
138.41 hm³
Volume stored
52 hm³
Coordinates
40.170°N, 101.060°W
Last updated
2026-09-09
Current fill
37.7%vs 7 days ago
-0.5%losing
vs 1 year ago
-1.5%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: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.170, -101.060 · Open in Google Maps
About Swanson Lake
As of September 9, 2026, Swanson Lake is filled to 37.7% of its total capacity, holding roughly 52 hm³ of water out of a maximum 138 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-0.5 pts), and it is 1.5 points below its level on the same date a year earlier.
Across the readings we hold for Swanson Lake — 1824 data points between September 12, 2021 and September 9, 2026 — the level has ranged from a low of 21.7% (December 8, 2022) to a high of 63.2% (June 8, 2024). On average the reservoir is fullest around June and at its lowest around November.
It is operated by BOR primarily for multiple purposes. It lies within the Nebraska basin at 40.170°N, 101.060°W.
Key facts
- Current fill level
- 37.7%
- Water stored
- 52 hm³
- Total capacity
- 138 hm³
- 7-day change
- ▼ 0.5 pts
- Year-on-year
- ▼ 1.5 pts
- Primary use
- Multipurpose
- River basin
- Nebraska
- Operator
- BOR
- Coordinates
- 40.170°N, 101.060°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 37.7% | 52 |
| 8 Sep 2026 | 37.7% | 52 |
| 7 Sep 2026 | 37.6% | 52 |
| 6 Sep 2026 | 37.6% | 52 |
| 5 Sep 2026 | 37.6% | 52 |
| 4 Sep 2026 | 37.7% | 52 |
| 3 Sep 2026 | 38.0% | 53 |
| 2 Sep 2026 | 38.2% | 53 |
| 1 Sep 2026 | 38.4% | 53 |
| 31 Aug 2026 | 38.7% | 54 |
| 30 Aug 2026 | 38.8% | 54 |
| 29 Aug 2026 | 39.0% | 54 |