Reservoir · Nebraska · United States · BOR RISE
Swanson Lake
Swanson Lake and Trenton Dam
36.9% full
Capacity
138.41 hm³
Volume stored
51 hm³
Vs month average
96% of normal
Coordinates
40.170°N, 101.060°W
Last updated
2026-10-28
Current fill
36.9%vs 7 days ago
+0.2 ppgaining
vs 1 year ago
-3.8 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
96%of normal
36.9% full on 2026-10-28, against an average of 38.3% for October across 6 years of readings (-1.4 points).
Drought Monitor at this site · 27 October 2026
D0abnormally dry
The ground at Swanson Lake's coordinates falls inside the D0 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Nebraska drought figures →
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: 2026-10-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.170°N, 101.060°W · Open in Google Maps
About Swanson Lake
As of October 28, 2026, Swanson Lake is filled to 36.9% of its total capacity, holding 51.11 hm³ of water out of a maximum 138.41 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (+0.2 pp), and it is 3.8 points below its level on the same date a year earlier.
Across the readings we hold for Swanson Lake — 1825 data points between October 30, 2021 and October 28, 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 October.
It is operated by BOR primarily for multiple purposes. It is at 40.170°N, 101.060°W.
Key facts
- Current fill level
- 36.9% of total capacity
- Water stored
- 51.11 hm³
- Total capacity
- 138.41 hm³
- 7-day change
- ▲ 0.2 pp
- Year-on-year
- ▼ 3.8 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 40.170°N, 101.060°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 36.9% | 51.11 |
| 27 Oct 2026 | 36.9% | 51.11 |
| 26 Oct 2026 | 36.9% | 51.04 |
| 25 Oct 2026 | 36.8% | 50.93 |
| 24 Oct 2026 | 36.6% | 50.71 |
| 23 Oct 2026 | 36.7% | 50.75 |
| 22 Oct 2026 | 36.7% | 50.75 |
| 21 Oct 2026 | 36.7% | 50.82 |
| 20 Oct 2026 | 36.7% | 50.86 |
| 19 Oct 2026 | 36.7% | 50.86 |
| 18 Oct 2026 | 36.8% | 50.93 |
| 17 Oct 2026 | 36.8% | 51 |