119834
By the 1950 s , the upper states , Colorado , Utah , New Mexico , and Wyoming , obligated to send a set amount of water downstream regardless of seasonal fluctuations in water levels , also began to see the wisdom of creating a system of dams and reservoirs .
 Colorado, Utah, New Mexico, Wyoming
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Colorado, Utah, New Mexico, Wyoming