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. . storage was only about 25 percent of average at the close of the report period. Status of the stream-gage network is as follows: (1) In Arizona, 134 stations continued, 2 stations discontinued, and 5 stations estab- lished or under construction. The stations discontinued were on Queen Creek at Whitlow dam site near Superior and on Sabino Creek near Mount Lemmon. The new stations will evaluate effects of watershed modification and management. These are on Pantano Wash near Vail, Cibecue Creek near Chrysotile, Webber Creek above the West Fork near Pine, West Fork Webber Creek near Pine, and Webber Creek'below the West Fork near Pine. (2) In California, 667 stations for which records will be published, (3) In Colorado, the station on Gunnison River near Grand Junction was moved upstream 7 miles, above the Redlands canal. (4) In Nevada, no change. (5) In New Mexico, a new station established on San Francisco River near Reserve, and six crest~stage gages installed in the Gila and San Juan river basins for rating by indirect measurements. (6) In Oregon, a new station on Klamath River below Big Bend power plant. (7) In Utah, a primary station was established on Box Elder Creek at Mantua; stations were discontinued on 10 small transmountain diversions from the Colorado River Basin to the Great Basin. (S) In Wyoming, no chang~. Offset copy for the compilation of streamflow records through 1950 was completed for the Great Basin and is in progress for the Pacific Slope in California. Significant progress in :!,nterpretive and hydrologic studies includes first-draft reports on (1) the interchange of surface and ground water along selected streams in the Sacramento and San Joaquin Valleys in California, and (2) the tide-affected flow of the Sacramento River at Sacramento. A yearly Water Summary for Southern California was prepared. Ground Water.- Collection of basic data and mapping of relevant geologic features continued in problem areas, largely in cooperation with State agencies and other Federal agencies. New starts, completions, and noteworthy findings include: (1) In Arizona, reports in the review stage cover the Snowflake-Taylor area, the Bonita Creek area near Safford, water resources for the Hualapai Indian Reservation, and Grand Canyon National Park. (2) In California,a reconnaissance of the Pinnacles National Monument was started in May. Reports released to open file cover the Fremont Valley area of Kern County, and progress in the study of land subsidence in the San Joaquin Valley. In connection with the latter study, tilt~eter observations have measured micro-deformation of the land sur- face caused by pumping from wells, and have led to determination of elastic and other properties of earth materials in place. (3) In Colorado, a draft report on the Ute Mountain Ute Indian Reservation was completed. (4) In Nevada, a general study in the northwestern part of the State was begun, with first attention to the Kings River 'valley. Also, reconnais- sance of the Winnemucca Lake area in Washoe and Pershing Counties was started, and potential well sites on Cactus Flat were selected for the Atomic Energy Commission. (5) In New Mexico, interim reports were com- -$-