Overview Realtime Historical Map View
Extreme Heat Warning
2026-08-04T20:00:00-07:00

* WHAT...Dangerously hot conditions, with temperatures around 105 to 110 degrees expected. * WHERE...Marble and Glen Canyons. * WHEN...Until 8 PM MST /9 PM MDT/ Tuesday. * IMPACTS...Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with prolonged outdoor exposure.

Colorado River At Lees Ferry, Az Historical Data

Historical Data


Streamflow Range


Date Average 2026 2025 2024 2023 2022 2021 2020 2019 2018 2017 2016 2015 2014 2013 2012 2011
01-01 12352.5
01-02 12518.18
01-03 13124.17
01-04 12882.73
01-05 13300.0
01-06 13328.33
01-07 13631.67
01-08 13095.0
01-09 13523.33
01-10 13320.0
01-11 12889.17
01-12 12596.67
01-13 12856.67
01-14 12776.67
01-15 12978.33
01-16 13076.67
01-17 13105.38
01-18 13003.08
01-19 13235.38
01-20 12823.08
01-21 12998.33
01-22 13097.69
01-23 13249.17
01-24 12984.62
01-25 13038.46
01-26 12966.67
01-27 12920.83
01-28 13296.15
01-29 13397.69
01-30 13010.0
01-31 13136.43
02-01 12813.57
02-02 11384.29
02-03 11477.86
02-04 11570.71
02-05 11376.43
02-06 11543.85
02-07 11556.92
02-08 11517.69
02-09 11286.43
02-10 11453.57
02-11 11486.15
02-12 11727.86
02-13 11945.71
02-14 11905.0
02-15 11894.29
02-16 11822.86
02-17 12040.0
02-18 12080.0
02-19 11724.62
02-20 11927.86
02-21 12023.57
02-22 11898.57
02-23 11797.14
02-24 11837.86
02-25 11907.5
02-26 11919.23
02-27 11952.86
02-28 12033.57
02-29 12850.0
03-01 11935.0
03-02 10892.86
03-03 10735.71
03-04 11195.71
03-05 10797.14
03-06 10697.86
03-07 10894.29
03-08 10681.43
03-09 10740.0
03-10 10677.14
03-11 10770.0
03-12 10813.57
03-13 10695.0
03-14 10925.71
03-15 11198.57
03-16 10732.86
03-17 10416.43
03-18 10526.43
03-19 10404.0
03-20 10444.29
03-21 10706.67
03-22 10932.86
03-23 11474.67
03-24 11640.0
03-25 11728.0
03-26 11117.33
03-27 11128.67
03-28 11132.67
03-29 11308.67
03-30 11090.0
03-31 11280.0
04-01 10645.33
04-02 10740.0
04-03 10881.33
04-04 10628.67
04-05 10947.33
04-06 11131.43
04-07 11104.67
04-08 11594.67
04-09 11720.0
04-10 10736.0
04-11 11185.33
04-12 10979.29
04-13 10877.14
04-14 10991.43
04-15 10964.62
04-16 10856.15
04-17 11161.54
04-18 10886.15
04-19 11172.31
04-20 10812.31
04-21 11007.14
04-22 11042.86
04-23 11092.14
04-24 10705.71
04-25 12417.69
04-26 12784.29
04-27 12767.14
04-28 11192.86
04-29 11042.14
04-30 10818.46
05-01 11088.67
05-02 11790.0
05-03 11781.43
05-04 11984.0
05-05 12004.0
05-06 11528.67
05-07 11738.67
05-08 12087.86
05-09 11746.0
05-10 11536.43
05-11 11780.0
05-12 11960.67
05-13 11494.67
05-14 11788.57
05-15 12575.38
05-16 12413.57
05-17 12342.86
05-18 12205.33
05-19 12252.0
05-20 12117.86
05-21 12296.0
05-22 12324.67
05-23 12066.67
05-24 12146.0
05-25 11628.67
05-26 11677.33
05-27 11626.67
05-28 11805.33
05-29 11547.33
05-30 11958.67
05-31 11688.67
06-01 11773.33
06-02 13386.67
06-03 13086.0
06-04 13306.0
06-05 13947.86
06-06 14006.43
06-07 13165.71
06-08 13422.0
06-09 13286.0
06-10 13600.67
06-11 13217.33
06-12 13670.71
06-13 13785.0
06-14 13331.43
06-15 13754.0
06-16 13560.0
06-17 13453.33
06-18 13415.33
06-19 13709.29
06-20 13890.71
06-21 13504.29
06-22 13407.14
06-23 13835.71
06-24 13657.14
06-25 13885.71
06-26 14271.43
06-27 14035.71
06-28 13225.0
06-29 13907.14
06-30 13657.86
07-01 13779.29
07-02 14917.14
07-03 15722.86
07-04 14596.92
07-05 14404.67
07-06 14932.67
07-07 15535.0
07-08 15515.71
07-09 16250.0
07-10 15278.67
07-11 15372.0
07-12 14939.29
07-13 14898.57
07-14 14884.0
07-15 14737.33
07-16 15262.86
07-17 15300.67
07-18 14563.57
07-19 14911.33
07-20 15046.0
07-21 14800.67
07-22 15082.86
07-23 15423.33
07-24 15050.0
07-25 15107.33
07-26 15071.33
07-27 15034.0
07-28 14797.33
07-29 14419.33
07-30 15208.0
07-31 15306.0
08-01 15524.62
08-02 14458.57
08-03 15139.33
08-04 15664.29
08-05 15350.0
08-06 15585.71
08-07 15103.57
08-08 15479.23
08-09 15323.08
08-10 15775.0
08-11 15342.86
08-12 15169.23
08-13 15500.0
08-14 15190.0
08-15 15740.71
08-16 15169.23
08-17 15466.67
08-18 16266.67
08-19 14938.46
08-20 15753.85
08-21 15548.46
08-22 15236.15
08-23 15430.77
08-24 15553.85
08-25 15353.85
08-26 14707.14
08-27 15328.57
08-28 15403.85
08-29 15384.29
08-30 15321.43
08-31 14808.33
09-01 14584.29
09-02 11667.86
09-03 11440.71
09-04 11652.86
09-05 11683.57
09-06 11383.57
09-07 11824.29
09-08 11402.86
09-09 11282.14
09-10 10884.62
09-11 11181.43
09-12 11419.29
09-13 10826.15
09-14 10967.86
09-15 11342.86
09-16 10959.23
09-17 10851.43
09-18 11219.29
09-19 11337.86
09-20 11231.43
09-21 11180.77
09-22 10805.71
09-23 11525.0
09-24 11436.43
09-25 11427.86
09-26 11312.86
09-27 11443.57
09-28 11200.0
09-29 11462.14
09-30 11383.08
10-01 11085.0
10-02 10180.0
10-03 9748.46
10-04 10179.23
10-05 9914.29
10-06 9697.14
10-07 10244.29
10-08 9997.14
10-09 9980.71
10-10 10243.57
10-11 9652.14
10-12 10059.29
10-13 9921.43
10-14 9976.43
10-15 10294.62
10-16 10234.62
10-17 10177.86
10-18 10083.57
10-19 9992.14
10-20 9654.62
10-21 9968.46
10-22 9990.71
10-23 10266.43
10-24 10098.57
10-25 9781.43
10-26 9870.77
10-27 9902.86
10-28 9942.31
10-29 9816.43
10-30 9955.0
10-31 9961.43
11-01 9698.33
11-02 9591.54
11-03 9533.08
11-04 9956.43
11-05 9557.86
11-06 11973.08
11-07 12231.54
11-08 14384.62
11-09 11802.31
11-10 11750.77
11-11 13990.77
11-12 15250.0
11-13 14108.46
11-14 14296.92
11-15 14135.38
11-16 11255.0
11-17 9981.43
11-18 9800.77
11-19 9902.31
11-20 12627.69
11-21 12670.71
11-22 12620.0
11-23 11738.46
11-24 10123.08
11-25 10111.54
11-26 10147.86
11-27 9995.83
11-28 10040.77
11-29 10060.0
11-30 10071.43
12-01 10198.57
12-02 12479.29
12-03 12642.14
12-04 12392.14
12-05 12644.29
12-06 12504.62
12-07 12692.14
12-08 12644.29
12-09 12280.0
12-10 12730.71
12-11 12751.43
12-12 13056.43
12-13 12925.71
12-14 12378.46
12-15 12230.0
12-16 12688.33
12-17 12718.33
12-18 12441.54
12-19 12687.69
12-20 12245.83
12-21 12499.17
12-22 12470.0
12-23 12838.46
12-24 12648.46
12-25 12285.38
12-26 11960.0
12-27 12615.0
12-28 12776.67
12-29 11921.82
12-30 12606.36
12-31 12261.67

Annual Peak Streamflow


Seasonal Comparison


Oceanic Nino Index