Colorado River Basin Natural Flow and Salt Data
The provisional natural flow is an early estimate of natural flows at the Colorado River at Lees Ferry, AZ. It is provided to give water operators and stakeholders insight into the natural flows since the most recent published year. Estimates depend on Reclamation's 24 Months Study and are published following the completion of the January, April and August studies. Estimates are developed from either the historical unregulated inflow or the forecasted unregulated inflow into Lake Powell from the Colorado Basin River Forecast Center (CBRFC). Estimates from previous studies are provided to help users understand the evolution of the provisional natural flow. Provisional data are not used for modeling purposes in CRSS.
Please note that data is SUBJECT TO CHANGE over the entire record due to source data updates.
Natural Flow and Salt Data IndexCurrent Natural Flow and Salt Data
Natural Flow Supporting Data
Natural Salt Supporting Data
Previous Natural Flow and Salt Data
Provisional Natural Flow Data
PROVISIONAL natural flow data 1906-2023 (Excel file, 0.3 MB) based on the August, 2023 24 MS.Contact: firstname.lastname@example.org
PROVISIONAL natural flow data 1906-2023 (Excel file, 0.3 MB) based on the April, 2023 24 MS.
PROVISIONAL natural flow data 1906-2023 (Excel file, 0.3 MB) based on the January, 2023 24 MS
Last Updated: 17APR2023