Lake Powell · Lake Mead · Streamflow gauges · Snowpack · USGS, USBR & NRCS data
Reservoir levels (Lake Powell & Mead) from USBR Hydrologic Database (HDB) — daily observations updated each morning.
Streamflow is real-time from USGS NWIS, updated every 15–60 min. Values in cubic feet per second (cfs).
Snowpack from NRCS SNOTEL at Grand Mesa, CO (10,600 ft), updated daily. SWE = snow water equivalent in inches.
Lees Ferry, AZ is the legal accounting point dividing the Upper and Lower Colorado Basin under the 1922 Colorado River Compact.