Location context and information
The datum of the gage has been determined to be 4.37 ft above NAVD 1988. To obtain stream water-surface elevation values in NAVD 1988, add 4.37 ft to gage height values.
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Continuous data graphs Lake Merwin at Ariel, WA - USGS-14220000
Important for you to know:
- Scheduled Maintenance NoticeUSGS will be performing maintenance on the time series data processing system beginning at 08:00 EST on April 2, 2026. During this period, delivery of the latest time series data will be delayed. The maintenance is expected to finish within 3 hours, after which all backlogged time series data will be processed and delivered to WDFN web portals and APIs.