{"nrhp_refnum":"100007817","name":"ROBERT GRAY (hydrographic survey vessel)","other_names":["Lt666","Don J Miller II"],"category":"structure","location":{"address":"800 Wharf St.","address_restricted":false,"city":"Richmond","county":"Contra Costa County","state":"CA","lat":37.92134000000004,"lon":-122.37129999999996,"geom_source":"nps_gis"},"listed_date":"2022-06-27","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Military","Science","Exploration/Settlement","Engineering"],"significance_levels":["local"],"summary":null,"photo":null,"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":null,"wikipedia":null,"wikidata":null},"indexable":false,"url":"https://nationalhistoricalregister.com/california/contra-costa-county/robert-gray-hydrographic-survey-vessel-100007817/"}