Using Synthetic Aperture Radar (SAR) interferometry, we detect several centimeters of uplift that accumulated during two years (1993--1995) around the vent of the New Trident volcano in Alaska's Katmai National Park. The areas of image coherence correspond to fresh, blocky lavas, while coherence is lost in ashcovered areas. From the uplift gradient we estimate the depth of a pressure source under New Trident volcano to be approximately 0.8--2.0 km. Our results show that in spite of the difficult sub-arctic environment of southern Alaska, strain build-up can be monitored over a two-year period, showing the potential for global monitoring of volcano deformation using SAR interferometry.¿ 1997 American Geophysical Union