A 24-month report is a document from the Bureau of Reclamation which provides information about the conditions of main reservoirs in the Colorado River basin and projections for the near future. For instance, the report is essential for making a determination about operating criteria for shortage and surplus declarations.

VISIT THIS WEBPAGE For additional information on dam operations,

Upper Colorado River Basin Water Resources Division

Lower Colorado River Basin Water Resources Division

NEWS

• 2021, April - The 24-Month Report was a shocker, but is it too optimistic? Kuhn.

REPORTS

• Evaluating the Accuracy of Reclamation’s 24-Month Study Lake Powell Projections. USU, 2022.
• Leakage/seepage; around/through; Glen Canyon Dam. John Weisheit, 2023.
• 2023 - A survey of the Bureau of Reclamations Decree Accounting Reports in the Lower Colorado River Basin. McCoy for ASCE.

MONTHLY RESERVOIR SUMMARY

• Lake Powell monthly summary website
• Lake Mead monthly summary website
• Lake Powell monthly summary - Water Year 2000 to 2013
• Lake Powell monthly summary - Water Year 2000 to 2017
• Glen Canyon Dam Updates - 2010 to 2016. RRFW RiverWire.

ARCHIVE OF 24-MONTH REPORTS

• Reports combined from 2003 to 2020 (there are gaps)

January 24-Month Reports Only

• Flaming Gorge Dam 2006 to 2020 (January only)
• Hoover & Glen Canyon dams 2002 to 2023. ZIP FILE
• AOPs combined 2000 to 2024. Only data pertinent to Lake Powell and Lake Mead. ZIP FILE.

24-MONTH REPORTS BY THE YEARS

• The missing years: Reservoir elevations at Lake Powell are located HERE
• Upper Basin historic reservoir operations are located HERE
• Lower Basin historic reservoir operations are located HERE

2003

• July; December

2004

• January; April; July; September; October; November; December

2005 - Begin the development of Shortage Guidelines (Interim Guidelines)

• January; February; March; May

2006

• January

2007 - Conclude the development of Interim Guidelines

• January; February; March; April; May; June; July; August; September; October; November; December

2008

• January; February; March; April; May; June; July; August; September; October; November; December

2009

• January; February; March; April; May; June; Juyl; August; September; October; November (lc); November (uc); December (uc); December (lc)

2010 - Begin the Supply and Demand "Basin Study" (not a NEPA Process)

• January; February; March; Aprii; May; June; August; September; October; November; December

2011 - Begin development of Long-Term Experimental and Management Plan for Glen Canyon Dam

• January; February; March; April; May; June; July; August; September; October; November; December

2012 - End Supply and Demand "Basin Study (not a NEPA process)

• January; February; March; April; May; June; July; August; September; October; November; December

2013

• January; February; March; April; May; June; July; August; September; October; November; December

2014 - Begin the development of Drought Contingency Planning (not a NEPA process)

• January; February; March; April; May; June; July; August; September; October; November; December

2015

• January; February; March; April; May; June; July; August; September; October; November; December

2016

• January; February; March; April; May; June; July; August; September; October; November; December

2017

• January; February; March; April; May; June; July; August; September; October; November; December

2018 - Finish Tribal Water Basin Study & Develop 5-year projected future conditions

• January; February; March; April; May; June; July; August; September; October; November; December

2019  - Conclude the development of Drought Contingency Planning (not a NEPA process)

• January; February; March; April; May; June; July; August (LB); August (UB); USBR Press Release; September; October; November; December