{"subjectId":"reservoir-usgs-06857050","seriesUrlPattern":"/api/v1/series/{metricId}--{subjectId}.json","seriesCount":1,"observationCount":253,"series":[{"metricId":"reservoir-storage-volume","subjectId":"reservoir-usgs-06857050","unit":"Mm³","periodKind":"month","count":253,"from":"2002-10-01","to":"2026-09-01","sourceId":"usgs-nwis"}]}