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The relationship between water and energy is an important aspect in Colorado's water resources history. As detailed in other articles in this issue, water is essential to the creation of several forms of energy, and energy is essential both to treat and distribute water. Documentation of this interrelationship appears in a number of the collections held in Colorado State University's Water Resources Archive. The collections reflect organizations which have studied or sponsored studies of related issues as well as people who have con- sulted on the topic, locally, nationally and internation- ally. A sampling of how the topic of the water /energy nexus is documented in the Water Resources Archive follows. Perhaps the best place to begin in reviewing related collections is with that of Ival V. Goslin. As the first executive director of the Colorado Water Resources and Power Development Authority, Goslin oversaw the establishment of this organization, which began with as- sisting in the planning, design and construction of water supply projects in the state. Goslin served as executive director from 1982 to 1985 and continued his relation- ship with the Authority as a special consultant until his death in 1991. The Colorado legislature initially created the Authority to conduct feasibility studies on various water resource projects and basin -wide studies. In 1988, the Authority's mandate was expanded to incorporate the funding of wastewater treatment projects by creating the Water Pollution Control Revolving Fund to make loans from Environmental Protection Agency grants under the fed- eral Clean Water Act of 1987. In 1989, the Authority's statute was again revised to give its Board of Directors sole responsibility for funding projects of $10 million or less. By this time, it was clear the Authority had changed direction from conducting water project feasi- bility studies to creating and implementing the funding programs for water and wastewater infrastructure. The Goslin Collection is largely comprised of engineer- ing reports and basic data from the Authority- funded water planning studies of the 1980s. They contain a great deal of information about hydropower projects in relation to proposed dams in the state. Though only one of the projects studied and documented in the Goslin Collection was ever built, the rest of the reports, maps and data give a good sense of what was being investi- gated and why the projects were not constructed. It is an excellent set of documents showing water and power de- velopment issues across the state in the 1980s. Selected reports from the Goslin Collection are among the first items from the Water Resources Archive being scanned for sharing on the Internet. One collection in the Water Resources Archive that has a substantial amount of information on water /energy relationships is the Groundwater Data Collection. This collection is a compilation of various studies conducted by CSU engineers over several decades, mainly the 1940s through the 1970s. One portion of the collection is a study of power consumption by irrigation pumps conducted from 1957 through 1978. The study was done in relation to groundwater fluctuation investigations and focused mainly on the Front Range and eastern plains. Data was collected directly from power and gas com- panies on the amount of power consumed by irriga- tion pumps and is found here in raw form as well as in annual summaries. In addition to the reports and data, there are also maps, charts and correspondence. Another important section of the Groundwater Data Collection contains the field books of William E. Code. An irrigation engineer, Code worked for the Agricul- tural Experiment Station from 1928 until his retirement in 1958. He spent a great deal of time investigating groundwater and irrigation issues, including pumping water for irrigation. More than fifty of the field books in which he collected data exist in the Groundwater Data Collection, and fifteen of them relate to pump tests and pumping plant data, dating from 1928 to 1954. 12