{"nrhp_refnum":"100010944","name":"Haverhill Powder House","other_names":[],"category":"structure","location":{"address":"91 Powder House Avenue","address_restricted":false,"city":"Haverhill","county":"Essex County","state":"MA","lat":42.772504000000026,"lon":-71.05578499999996,"geom_source":"nps_gis"},"listed_date":"2024-10-28","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Military","Architecture","Community Planning and Development"],"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/massachusetts/essex-county/haverhill-powder-house-100010944/"}