Provenance
original source http://www.gcdamp.gov/aboutamp/crb.html

Reuse
from their disclaimer
The information presented on this web site is considered public information and may be distributed or copied, but it is requested that in any subsequent use, the Glen Canyon Dam Adaptive Management Program be given appropriate acknowledgement. While we make every effort to provide accurate and complete information, various data including links, names, phone numbers, etc., may change prior to updating. We make every effort to provide accurate data according to the resources available to us. However, we do not warrant or represent that the information provided here is complete and free from errors, omissions, or changing data.