[en] A rotary-wing, reconnaissance high sensitivity radiometric and magnetic survey in northeast Washington. Three 1 : 250,000 scale NTMS Quadrangles (Spokane, Sandpoint and Okanogan) were surveyed. A total of 14,421 line miles of data were collected. Traverse lines were flown in an east-west direction at 1.0 and 3.0 mile spacing, with tie lines flown in a north-south direction at 12 mile spacing. The data were digitally recorded at 1.0 second intervals. The NaI terrestrial detectors used in this survey had a total volume of 2,154 cubic inches. The magnetometer employed was a modified ASQ-10 fluxgate system. This report covers only the Spokane NTMS 1 : 250,000 scale Quadrangle. The radiometric data were normalized to 400 feet terrain clearance. The data are presented in the form of computer listings on microfiche and as stacked profile plots. Profile plots are contained in Volume II of this report. A geologic interpretation of the radiometric and magnetic data is included as part of this report