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. 003057 ~ . . Dinosaur, Arches, and Capitol Reef National lmnuments and at Btyce Canyon National Park. (8) In Wyoming, a report on the Lyman-Mountain View area is in preparation. Chemical quality of water.- Records of dissolved constituents and temperature of streams were continued. Noteworthy aspects of the sampling-station network include; (1) In Arizona, stations on Little Colorado River at Cameron and Agua Fda River below Lake Pleasant Dame were discontinued. The Colorado River at Yuma nil sampled specially for the study of Worldwide Runoff of Dissolved Solids. At Tucson, facilities were set up for determining a few mineral constituents as indicators of changes in quality of natural waters. (2) In California, the network n01f includes 8 daily stations and 100 monthly stations. (3) In Colorado and New Mexico, the San Juan River and tributaries were sampled to de- termine th.e content of selenium in relation to pOSSible disposal of radioactive wastes. (4) In Utah, the network includes 13 daily stations.; one station, Green River near Greendale, was discontinued. The study of surface-water sources for publiC supply in the Jordan River Valley was continued.' (5) In the Uppar Colorado River basin, reconnaissance sampling at high, median, and low stages at about 350 sites was completed in December 1958. Chemical quality of ground waters was studied further in various areas. Reconnaissance samp1i~ of ground waters in the northern tl'ro- thirds of the Upper Colorado River Basin was comp1eted in September 1958. Sediment.- Sediment records on streams have been continued. In California, 4 new daily stations and 21 periodic stations have been added to the network through cooperation "i th the Bureau of Reclamation, Corps of Engineers, and Hunter Liggett Military Reservation. A1so in California, a start has been made on a resurvey of Lake Pillsbury by sonar. 01.0 'c research and s ecial studies.- Determination of evapora- tion y energy-budge me 10 was continued on reservoirs of the San Diego River system, California; also on Sahuaro Lake (Stewart Mountain), Canyon Lake (Morman Flat), Apache Lake (Horse Mesa), and Roosevelt Reservoir in Arizona. A study of the hydrologic effects of urbanization has been started on three small watersheds in the basin of San Francisquito Creek near Menlo Park, California. Two of these will afford direct observation of changes occurring during the transition from rural to residential en- viromnentJ' the third watershed will serve as a centr01 area, as it embraces land not likely to be developed in the foreseeab1e future. The Objective is quantitative and documented info~ion useful in defining or forecasting changes in the quantity and intensity of runoff, infiltra- tion, sediJ!lent yield, ehemical quality, and use of water; also, changes in the natUral pattern of surface drainage and ground-water movement. 9.