United States Bureau of Reclamation
Reservoir operations and Colorado River data
Daily storage, elevation, inflow and release for federal reservoirs in the western United States, including Lake Mead and Lake Powell, the two reservoirs whose decline defines the Colorado River shortage regime.
Rights
- Commercial reuse
- Yes
- Redistribution
- Yes
- Derivative use
- Yes
- Attribution required
- No
- Restrictions
- Applies to material authored by US federal agencies. Third-party material carried within a federal product may be separately protected.
- Terms last checked
- 23 August 2026
Access and coverage
- Publisher
- United States Bureau of Reclamation
- Geographic coverage
- Western United States
- Temporal coverage
- 1935 onwards
- Update frequency
- daily
- Formats
- csv, json, api
- Bulk download
- Available
- Registration required
- No
- Cost to Hydrionis
- Free
- Domains
- reservoir, river flow, drought
What Hydrionis holds from this publisher
The publisher’s own coverage is above. This is what Hydrionis has actually taken from it, at the subjects it measures — gauges, boreholes, reservoirs or places.
238,118
Values held
1,419
Series, each one measurement at one place
96
Subjects measured
1905–2026
Period actually held, not the publisher’s span
What is measured
- Reservoir inflow · m³/s
- Reservoir release · m³/s
- Reservoir stored volume · Mm³
- Reservoir water level · m
How current it is
- Current
- Read from USBR 4 days ago, and the newest monthly value covers 2026-09 — as current as this source gets.
Hydrionis products built from it
Where this publisher’s data reaches a reader. Each has its own page, with its licence and how to cite it.