{"site_no":"05459500","name":"Winnebago River at Mason City, IA","slug":"winnebago-river-at-mason-city-ia","url":"https://streamflowdata.com/stations/winnebago-river-at-mason-city-ia","state":"IA","county":"Cerro Gordo County","lat":43.165,"lng":-93.1925,"drainage_area_sqmi":526,"datum_ft":1069.51,"huc_code":"07080203","river":{"name":"Winnebago River","slug":"winnebago-river-ia"},"current":{"reading_time":"2026-05-30T00:30:00+00:00","discharge_cfs":494,"gage_height_ft":5.97},"flood_stage":{"action_stage_ft":8,"flood_stage_ft":10,"moderate_flood_ft":14.5,"major_flood_ft":15.5},"today_statistics":{"month":6,"day":11,"p10":54,"p25":130,"p50":330,"p75":626,"p95":2030},"recent_daily_values":[{"date":"2026-05-28","discharge_cfs":517,"gage_height_ft":null},{"date":"2026-05-27","discharge_cfs":527,"gage_height_ft":null},{"date":"2026-05-26","discharge_cfs":408,"gage_height_ft":null},{"date":"2026-05-25","discharge_cfs":424,"gage_height_ft":null},{"date":"2026-05-24","discharge_cfs":439,"gage_height_ft":null},{"date":"2026-05-23","discharge_cfs":459,"gage_height_ft":null},{"date":"2026-05-22","discharge_cfs":464,"gage_height_ft":null},{"date":"2026-05-21","discharge_cfs":476,"gage_height_ft":null},{"date":"2026-05-20","discharge_cfs":509,"gage_height_ft":null},{"date":"2026-05-19","discharge_cfs":527,"gage_height_ft":null},{"date":"2026-05-18","discharge_cfs":480,"gage_height_ft":null},{"date":"2026-05-17","discharge_cfs":449,"gage_height_ft":null},{"date":"2026-05-16","discharge_cfs":387,"gage_height_ft":null},{"date":"2026-05-15","discharge_cfs":325,"gage_height_ft":null},{"date":"2026-04-20","discharge_cfs":700,"gage_height_ft":null},{"date":"2026-04-19","discharge_cfs":800,"gage_height_ft":null},{"date":"2026-04-18","discharge_cfs":890,"gage_height_ft":null},{"date":"2026-04-17","discharge_cfs":950,"gage_height_ft":null},{"date":"2026-04-16","discharge_cfs":973,"gage_height_ft":null},{"date":"2026-04-15","discharge_cfs":998,"gage_height_ft":null},{"date":"2026-04-14","discharge_cfs":869,"gage_height_ft":null},{"date":"2026-04-13","discharge_cfs":636,"gage_height_ft":null},{"date":"2026-04-12","discharge_cfs":640,"gage_height_ft":null},{"date":"2026-04-11","discharge_cfs":643,"gage_height_ft":null},{"date":"2026-04-10","discharge_cfs":702,"gage_height_ft":null},{"date":"2026-04-09","discharge_cfs":793,"gage_height_ft":null},{"date":"2026-04-08","discharge_cfs":917,"gage_height_ft":null},{"date":"2026-04-07","discharge_cfs":1040,"gage_height_ft":null},{"date":"2026-04-06","discharge_cfs":1200,"gage_height_ft":null},{"date":"2026-04-05","discharge_cfs":1400,"gage_height_ft":null},{"date":"2026-04-04","discharge_cfs":1370,"gage_height_ft":null},{"date":"2026-04-03","discharge_cfs":633,"gage_height_ft":null},{"date":"2026-04-02","discharge_cfs":450,"gage_height_ft":null},{"date":"2026-04-01","discharge_cfs":396,"gage_height_ft":null},{"date":"2026-03-31","discharge_cfs":427,"gage_height_ft":null},{"date":"2026-03-30","discharge_cfs":447,"gage_height_ft":null},{"date":"2026-03-29","discharge_cfs":466,"gage_height_ft":null},{"date":"2026-03-28","discharge_cfs":498,"gage_height_ft":null},{"date":"2026-03-27","discharge_cfs":557,"gage_height_ft":null},{"date":"2026-03-26","discharge_cfs":611,"gage_height_ft":null},{"date":"2026-03-25","discharge_cfs":666,"gage_height_ft":null},{"date":"2026-03-24","discharge_cfs":739,"gage_height_ft":null},{"date":"2026-03-23","discharge_cfs":804,"gage_height_ft":null},{"date":"2026-03-22","discharge_cfs":853,"gage_height_ft":null},{"date":"2026-03-21","discharge_cfs":813,"gage_height_ft":null},{"date":"2026-03-20","discharge_cfs":653,"gage_height_ft":null},{"date":"2026-03-19","discharge_cfs":436,"gage_height_ft":null},{"date":"2026-03-18","discharge_cfs":341,"gage_height_ft":null},{"date":"2026-03-17","discharge_cfs":250,"gage_height_ft":null},{"date":"2026-03-16","discharge_cfs":286,"gage_height_ft":null},{"date":"2026-03-15","discharge_cfs":454,"gage_height_ft":null},{"date":"2026-03-14","discharge_cfs":457,"gage_height_ft":null},{"date":"2026-03-13","discharge_cfs":502,"gage_height_ft":null},{"date":"2026-03-12","discharge_cfs":519,"gage_height_ft":null},{"date":"2026-03-11","discharge_cfs":599,"gage_height_ft":null},{"date":"2026-03-10","discharge_cfs":702,"gage_height_ft":null},{"date":"2026-03-09","discharge_cfs":799,"gage_height_ft":null},{"date":"2026-03-08","discharge_cfs":852,"gage_height_ft":null},{"date":"2026-03-07","discharge_cfs":801,"gage_height_ft":null},{"date":"2026-03-06","discharge_cfs":341,"gage_height_ft":null}],"sources":{"usgs_nwis":"https://waterdata.usgs.gov/nwis","noaa_nwps":"https://api.water.noaa.gov/nwps/v1"},"license":"USGS data is in the public domain. Attribution: USGS National Water Information System (NWIS)."}