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Introduction Senior citizens familiar with rivers in the upper Colorado River Basin rep- resent important sources of historical data about endangered Colorado squaw- fish, razorback suckers, humpback chubs and bony tail chubs, With the passing of each of these seniors, potential knowledge about the endangered fish is lost. In the spring of 1991, the Information and Education Committee of the Recovery Program for the Endangered Fish of the Upper Colorado River Basin assigned me to complete a historical research project about the four endangered fish, The intent of the project was to gather and document historical information from upper basin seniors about the fish so that information could be used in information and education efforts. The project's research area included all of the historic endangered fish habitat in the upper Colorado River Basin, from Lake Powell upstream. To supplement the information provided by the seniors, data from newspa- pers, magazine articles, and to a lesser degree, technical reports, were collected, While the project's design did not call for an exhaustive review of techni- cal reports written about the fish, in researching and describing the history of the 1962 rotenone project of the upper Green River, it became necessary to refer to several such reports. I performed the field work for this project during four one-week trips into the upper basin in the spring and summer of 1991. Before each trip, I called senior-citizen centers, town offices, post offices and local businesses in the areas I would visit to help me identify seniors who had knowledge of the fish, Once I identified seniors in an area who knew about the fish, I called them and arranged interviews, During the calls I inquired about other people who knew of the endangered fish. Most of the time my contacts knew of several more people, and my list of potential interviewees grew quickly, During the four trips, I formally interviewed 111 seniors and talked to many others that lacked either knowledge of the fish or the capacity to remem- ber them. The average age of the 11 I persons I interviewed was just under 77. The oldest person questioned was born in 1895 and the youngest in 1947. Only five interviewees were born later than 1940. It is important to remember that the information in this report is dated. In general, the information comes from a time period beginning in 1910. Gaining information prior to this time was difficult, although a few seniors recalled earli- er stories about the fish, and they are included in the report, During the interviews, I tried to maintain a consistent line of questioning. However, depending on the individual senior's capacities and disposition, I modified my questioning to provide me with the most information and the senior with the most comfort. Each interview, except for a few telephone interviews, included a fish iden-