Instream Flow Administrative Calls

The CWCB monitors streamflow to ensure decreed instream flow (ISF) water rights are protected. If streamflow drops lower than the amount decreed to an ISF water right, and that right is in priority, staff may place an administrative call for water. The following table summarizes recent instream flow calls placed.

Last Updated: 8/17/2021
Instream Flow Appropriations

Water
Division
Stream Name Case Number

Date of Formal
Written Call

4 Slate River 80CW92 August 17, 2021
5 Roaring Fork River 76W2948 August 10, 2021
5 Colorado River 80CW447 October 22, 2020
5 Roaring Fork River 76W2948 September 30, 2020
5 Eagle River

80CW126
80CW134

August 24, 2020
5 Crystal River 75W2720 August 20, 2020
3 South Fork Rio Grande 84CW163 August 18, 2020
5 Hunter Creek Various August 12, 2020
5 Beaver Creek 75W2719 August 12, 2020
4 Washington Gulch 10CW180 August 11, 2020
6 Elk River 77W1279
77W1331
August 7, 2020
4 Slate River 80CW92 August 3, 2020
4 Dallas Creek 98CW0234 June 15, 2020
4 Slate River 80CW0092 September 16, 2019
4 Dallas Creek 98CW0234 September 6, 2019
6 Elk River 77W1279
77W1331
September 4, 2019
5

Beaver Creek

75W2719 August 15, 2019
5 Colorado River 80CW0447 November 9, 2018
2 North Fork South Arkansas River 77W4659 October 19, 2018
5 Piney River 86CW0229 September 19, 2018
5 Blue River 86CW0217 September 14, 2018
5 Eagle River 80CW0124
80CW0126
August 9, 2018
5 Beaver Creek 75W2719 August 9, 2018
5 Roaring Fork River 76W2948 August 9, 2018
5 Eagle River 78W3811 August 8, 2018
6 Elk River 77W1279
77W1331
August 8, 2018
5 Crystal River 75W2720 August 3, 2018
7 San Juan River 80CW0040 August 2, 2018
4 Slate River 80CW0092 July 19, 2018
5 Hunter Creek Various July 19, 2018
2 Cottonwood Creek 79CW0115 July 5, 2018
5 Colorado River 80CW0447 November 30, 2017
5 Beaver Creek 75W2719 September 7, 2017
5 Cross Creek 78W3795 September 7, 2017
4 Dallas Creek 98CW0234 September 7, 2017
4 Slate River 80CW0092 September 7, 2017
6 Elk River 77W1279
77W1331
August 31, 2017
5 Crystal River  75CW2720 August 29, 2017
5 Eagle River 78W3811 August 29, 2017
5 Fryingpan River 73W1955 August 29, 2017
1 South St. Vrain Creek 78W9362 October 24, 2016
7 Dolores River 75W1346 October 4, 2016
5

Colorado River

80CW0447 October 3, 2016
4 Slate River 80CW0092 September 16, 2016
5 Eagle River  77W3811 September 8, 2016
5 Crystal River 77W2720 August 31, 2016
6 Elk River 77W1279
77W1331
August 17, 2016
5 Roaring Fork River 76W2948 March 25, 2016
5 St. Louis Creek 90CW317 November, 2015
5 Colorado River 80CW447 November 13, 2015
4 Slate River 80CW092 October 16, 2015
6 Elk River 77W1279
77W1331
September 2, 2015