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 drawn down 1 to 2 feet each day this week in order to assist with debris removal

Generation Releases

Day Time Period Generators
7/26/2017 midnight - 8am 1
7/26/2017 8am - 11am 2
7/26/2017 11am - midnight 1
7/27/2017 midnight - midnight 1

Observed Data

Day Time (Eastern) Reservoir Elevation (behind dam)* Tailwater Elevation (below dam)* Average Hourly Discharge*
7/26/2017 4 PM 794.14 654.02 2,008
7/26/2017 5 PM 794.09 654.00 1,995
7/26/2017 6 PM 794.02 653.98 1,977
7/26/2017 7 PM 793.94 653.96 1,967
7/26/2017 8 PM 793.88 653.94 1,953
7/26/2017 9 PM 793.82 653.91 1,938
7/26/2017 10 PM 793.74 653.91 1,923
7/26/2017 11 PM 793.69 653.88 1,913
7/26/2017 midnight 793.62 653.85 1,902

Predicted Data

Day Average Inflow* Midnight Elevation* Average Outflow*
7/27/2017 725 792.20 1,710
7/28/2017 843 790.96 1,682
7/29/2017 2,178 794.07 13

*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.



Lake Info App

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