Great Falls

Latest Operating Information

Please note! Water release schedules often change without notice due to unanticipated changes in weather conditions and power system requirements.

Use caution near dams. A large amount of water may be discharged without warning at any time. Your safety depends on obeying all posted safety regulations and warnings. Learn more.

Great Falls will be spilling until further notice

Generation Releases

Day Time Period Generators
2/19/2018 midnight - midnight 2
2/20/2018 midnight - midnight 2

Observed Data

Day Time (Eastern) Reservoir Elevation (behind dam)* Tailwater Elevation (below dam)* Average Hourly Discharge*
2/19/2018 1 PM 795.91 660.11 9,775
2/19/2018 2 PM 795.96 660.14 9,888
2/19/2018 3 PM 795.98 660.16 9,964
2/19/2018 4 PM 795.98 660.17 9,978
2/19/2018 5 PM 796.01 660.18 10,013
2/19/2018 6 PM 796.00 660.17 10,037
2/19/2018 7 PM 795.99 660.18 10,034
2/19/2018 8 PM 795.98 660.16 10,025
2/19/2018 9 PM 795.96 660.15 9,987

Predicted Data

Day Average Inflow* Midnight Elevation* Average Outflow*
2/19/2018 11,005 795.83 11,573
2/20/2018 6,975 794.28 8,145
2/21/2018 5,490 793.56 6,002

*Elevations are in feet above sea level. Discharges are in cubic feet per second and are reported at the end of the hour.


Water release schedules are updated periodically throughout the day. Next-day release schedules are usually available by 6 p.m. of the current day.

Observed water levels also are updated periodically throughout the day. Predicted water levels are updated at least once a day, by 1 p.m. Eastern time, and may be updated more frequently when conditions warrant.

More Information on Great Falls

Operating Guide

General Overview

Sport Fish Survey Results



Reservoir Information

Get the most up-to-date information on the individual reservoirs TVA manages, including observed and predicted elevations, planned generation releases at the dams, reservoir operating guides, ecological health ratings, fish population survey results, recreation facilities and more.



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