TEMPERATURE

---

Prior to completion of Glen Canyon Dam in 1963, the temperature of water flowing through the Grand Canyon each year was highly variable, ranging from the icy, spring run-off to the warm, 85-degree summer-heated flows. However, once the dam was constructed, the temperature of the water released from the dam - drawn from the depths of Lake Powell and released through the dam's large penstock intakes - ranged for many years between 45 to 50 degrees. With the lowering of Lake Powell, release temperatures have been increased to as high as 57 degrees which has likely led to an increase in the humpback chub and other native fish populations in Grand Canyon.

---	---	---

Updates News Mainstem Temperature at the LCR 1990-2015: Temperatures on the Rise

Temperature Gages Colorado River at Lees Ferry Colorado River at 30 mile Colorado River above LCR Bright Angel Creek Colorado River abv Lava Canyon rm66 Colorado River bl rm127 Kanab Creek Havasu Creek Colorado River abv National Canyon Colorado River bl Diamond Creek Colorado River abv Spencer rm246 Reports and Links 2010 Selective withdrawal and sediment augmentation update Other Stuff TCD Learning Page GCDAMP TCD Page Reclamation TCD Page