{"nature":"This API supplies data organisation and trend description only. It is not a recommendation to act; the decision is yours. Purely descriptive - no judgement, no prediction. Every record carries an official source plus a record_hash (canonical sha256, recomputable offline for self-verification; cross-check with free /gauge/verify).","tier":"history-preview(free)","note":"Free preview: the last 7 snapshots, so you can see the shape. The full time series and CSV export are paid, at /gauge/history-series. History depth accumulates over time (data is still accumulating, so early records may be sparse). curated/emerging lines are snapshotted weekly and live lines daily or hourly, so time-series granularity differs by line - stated openly.","deprecation":{"effective_date":"2026-08-08","fields_removed":["series[].band","series[].record_hash"],"reason":"band is the result of matching against official thresholds and record_hash is a canonical sha256. Both are our own processing, not the free output of an upstream official API.","use_instead":{"band":"/gauge/ruler","record_hash":"/gauge or /gauge/history-series","price_source":"/manifest"},"unchanged":"The free preview still keeps 7 rows of snapshot_date + observed_at + current, so its original purpose - seeing the shape of the time series - is unchanged."},"signal_id":"hydrology.river-level","entity":"07010000","count":7,"series":[{"snapshot_date":"2026-08-19T00:00:00.000Z","observed_at":"2026-08-19T04:30:00.000Z","data_age_hours":1,"current":{"gauge_height_ft":13.1}},{"snapshot_date":"2026-08-18T00:00:00.000Z","observed_at":"2026-08-18T04:30:00.000Z","data_age_hours":1,"current":{"gauge_height_ft":13.35}},{"snapshot_date":"2026-08-17T00:00:00.000Z","observed_at":"2026-08-17T00:00:00.000Z","data_age_hours":0,"current":{"gauge_height_ft":11.37}},{"snapshot_date":"2026-08-15T00:00:00.000Z","observed_at":"2026-08-15T04:30:00.000Z","data_age_hours":1,"current":{"gauge_height_ft":6.2}},{"snapshot_date":"2026-08-14T00:00:00.000Z","observed_at":"2026-08-14T04:30:00.000Z","data_age_hours":1,"current":{"gauge_height_ft":5.76}},{"snapshot_date":"2026-08-13T00:00:00.000Z","observed_at":"2026-08-13T23:30:00.000Z","data_age_hours":1,"current":{"gauge_height_ft":5.8}},{"snapshot_date":"2026-08-11T00:00:00.000Z","observed_at":"2026-08-11T04:30:00.000Z","data_age_hours":1,"current":{"gauge_height_ft":4.86}}]}