About

Learn about our data sources, methodology, and how we calculate ramp accessibility

Data Sources

  • •
    USBR (Bureau of Reclamation): Official water elevation, content, inflow, and outflow data
  • •
    Weather API: Temperature data from OpenWeatherMap

Methodology

Water level data is collected daily from the USBR and stored in our database. Ramp accessibility is calculated based on current water elevation compared to each ramp's minimum safe and usable elevations.

Historical averages are calculated from all available data in our database, with separate calculations for all-time, since filled (June 22, 1980), and since Water Year 2000 (October 1, 1999).

Ramp Status Definitions

  • ✓

    Open and Usable

    Current elevation is at or above the ramp's minimum safe elevation.

  • ⚠

    Use at Own Risk

    Current elevation is between the minimum usable and minimum safe elevations.

  • ✗

    Unusable

    Current elevation is below the ramp's minimum usable elevation.