{"version":"1.0","type":"card","id":"f3b23fb4-6d51-44db-955b-1b38fe322f1c","url":"https://stacklist.com/card/f3b23fb4-6d51-44db-955b-1b38fe322f1c","title":"The Mariposa Bridge: Burbank Rancho's Most Historic Asset Most Residents Can't Name","source_url":"https://friendsofgriffithpark.org/mariposa-street-bridge-a-unique-historic-place/","note":"Built in 1939 after Gene Autry personally wrote a letter of support and thousands of Burbank residents signed a petition, the Mariposa Street Bridge is the only equestrian crossing over the LA River into Griffith Park's 55 miles of bridle trails. It was listed on the National Register of Historic Places in March 2024 — and most people who ride across it every week have no idea.\n","image":{"url":"https://ucarecdn.com/3891a445-9b28-4cce-b341-11c6d54cfe78/","alt":"The Mariposa Bridge: Burbank Rancho's Most Historic Asset Most Residents Can't Name","width":1200,"height":630},"stack":{"id":"a9bf96ff-a830-451d-94ea-d4a598a49ac5","title":"Hidden Burbank: Things 30-Year Residents Still Don't Know","url":"https://stacklist.com/c/places/stack/a9bf96ff-a830-451d-94ea-d4a598a49ac5"},"created_at":"2026-05-23T05:33:59.556Z","updated_at":null,"aco":{"summary":"Mariposa Street Bridge is a unique historic landmark in the Burbank Rancho area facing a crisis due to a proposed five-story 40-unit condominium development at 910 Mariposa. The development threatens protected Los Angeles River wildlife corridor land and the connection to Griffith Park, prompting residents to seek help for preservation.","tags":["mariposa-street","historic-landmark","burbank-rancho","wildlife-corridor","preservation","development-conflict","griffith-park"],"key_entities":[{"name":"Roy W Simison","type":"person","confidence":0.95},{"name":"Mariposa Street","type":"location","confidence":0.95},{"name":"Burbank Rancho","type":"location","confidence":0.9},{"name":"Mariposa Horse Bridge","type":"location","confidence":0.85},{"name":"Griffith Park","type":"location","confidence":0.9},{"name":"River LA","type":"organization","confidence":0.85},{"name":"Santa Monica Mountain Conservancy","type":"organization","confidence":0.9},{"name":"Los Angeles River Wildlife Corridor","type":"concept","confidence":0.9},{"name":"Proposed Condominium Development at 910 Mariposa","type":"event","confidence":0.85}],"classification":"memo","language":"en","confidence":0.85,"provenance":{"model":"claude-haiku-4-5","tool":"@stacklist/be@0.1.0","confidence":0.85,"timestamp":"2026-05-23T05:34:05.516Z"},"token_counts":{"approximate":142,"cl100k":132},"content_hash":"sha256:423ded55899832754a1aceca07df4e7cca9f084832d6fc9f43e9ecd894125e88","acp_version":"0.2","body_available":true,"body_tokens":142,"visibility":"public","agent_accessible":true,"status":"final"},"_links":{"self":"/api/public/card/f3b23fb4-6d51-44db-955b-1b38fe322f1c.json","html":"https://stacklist.com/card/f3b23fb4-6d51-44db-955b-1b38fe322f1c","md":"/api/public/card/f3b23fb4-6d51-44db-955b-1b38fe322f1c.md","stack_json":"/api/public/stack/a9bf96ff-a830-451d-94ea-d4a598a49ac5.json"}}