{"nrhp_refnum":"81000532","name":"Greisemer's Mill Bridge","other_names":[],"category":"structure","location":{"address":"NW of Boyerstown on T 579, Oley Township","address_restricted":false,"city":"Oley","county":"Berks County","state":"PA","lat":40.36292378200005,"lon":-75.73807501499994,"geom_source":"nps_gis"},"listed_date":"1981-02-23","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Engineering","Transportation"],"significance_levels":["state"],"summary":{"what_it_is":"A Burr truss covered bridge carrying a road over Manatawny Creek in Oley Township, Berks County, Pennsylvania, dated 1868 in the nomination.","why_significant":"The form describes it as the last remaining covered bridge of the 37 original covered bridges in Berks County, and it is listed as part of a thematic group of county covered bridges. Its Burr arch design, gable roof and stone abutments are presented as typical of the surviving county bridges, and it is in excellent condition after repairs in 1957 and 1971.","narrative":"Greisemer's Mill Bridge is a covered bridge across Manatawny Creek in Oley Township, Berks County, Pennsylvania. Its records date it to 1868. The bridge uses a Burr truss, a timber arch design, and it is 124 feet long and 14 feet 6 inches wide, with a clearance of 12 feet and a posted load limit of 3 tons. It has a gable roof, stone abutments and wide horizontal plank siding with a small window opening near the eaves. These features are shared with the other surviving covered bridges in Berks County. Of the 37 original county covered bridges, it is described as the last one remaining. Its significance lies in this survival as a representative example of the county's covered bridge building tradition. Repairs were carried out in 1957 and 1971, and the bridge is described as being in excellent condition.","period_of_significance":null,"architect_builder":null,"architectural_style":"Burr truss covered bridge","criteria":[],"status_note":"In excellent condition after repairs in 1957 and 1971.","vacant_flag":null,"machine_generated":true,"model":"claude-haiku-5-5","prompt_version":"v1.1-2026-10-29","generated_at":"2026-10-29 17:11:33.37929-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/lz/electronic-records/rg-079/NPS_PA/81000532.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/81000532/1ecd0473c3-800.webp","url_1600":"https://nationalhistoricalregister.com/media/81000532/1ecd0473c3-1600.webp","licence":"Public domain","author":"Cervin Robinson, Photographer","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Griesemer_Mill_Covered_Bridge,_3.5_miles_north_of_State_Route_562,_spanning_Manat,_Yellow_House_vicinity_(Berks_County,_Pennsylvania).jpg\" rel=\"noopener\">Cervin Robinson, Photographer</a>, Public domain, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Griesemer_Mill_Covered_Bridge,_3.5_miles_north_of_State_Route_562,_spanning_Manat,_Yellow_House_vicinity_(Berks_County,_Pennsylvania).jpg"},"district":{"nrhp_refnum":"83002218","name":"Oley Township Historic District","url":"https://nationalhistoricalregister.com/districts/pennsylvania/oley-township-historic-district-83002218/"},"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/71992372","wikipedia":"https://en.wikipedia.org/wiki/Greisemer%27s_Mill_Bridge","wikidata":"https://www.wikidata.org/wiki/Q5607325"},"indexable":true,"url":"https://nationalhistoricalregister.com/pennsylvania/berks-county/greisemers-mill-bridge-81000532/"}