Oblique view of shaded-relief bathymetry of Crater Lake, Oregon, looking north.
Colored region is the new shaded-relief bathymetry of the lake floor.
Distance across the lake is approximately 9.5 km. The plan to map the lake bottom was initiated last year by Mac Brock of the National Park Service, which partnered with the USGS to fund the mapping. The multibeam acoustic transducer is the red object mounted just forward of the keel. Logistics were complicated by the fact that the lake surface lies about 1,000 ft below the crater rim and is accessible only from the air or by a mile-long foot trail. An element of suspense was introduced when the commercial helicopter scheduled to do the airlift was diverted to fight wildfires.