Interestingly, now the river temperature is 8-10 * C, which is 20 * less than 100 years ago. This happened due to the construction of a hydroelectric dam, as a result of which, on the one hand, Lake Powell was formed, on the other hand, the flora and fauna of the river completely changed. Due to the decrease in river temperature, the population of predatory fish has increased, which has put other fish species at risk of extinction