3 documented waterfalls in Idaho, when each one actually runs, and what the river is doing right now where a gauge exists.
Trail status, closures and safety rules belong to each falls' managing agency, named and linked on every page.
Each card carries the typical big-water window drawn from the falls' actual driver, and the latest USGS reading on its feeding river where a gauge exists. The full page for each falls explains the season, shows today against the USGS percentile band, and quotes the managing agency on access.
The Niagara of the West: 212 feet tall and 900 feet wide when the Snake River is allowed to come over, and nearly dry by fall when Milner Dam sends the water to farms instead.
The bigger of the two Mesa Falls, on the last stretch of major Idaho falls never harnessed for irrigation or power: a wild Henrys Fork pouring off a volcanic ledge.
A 65 foot plunge over a 200 foot wide ledge of ancient volcanic tuff, viewed from an overlook on the Mesa Falls Scenic Byway and open even while its upper sibling is under renovation.
Live readings: USGS Water Services (National Water Information System). Instantaneous values and daily statistics services. U.S. Geological Survey data are works of the United States Government and are in the public domain.
Most of Idaho's documented falls run on snowmelt, so they peak when the high country lets go and fade through the summer. The mix here is 2 snowmelt, 1 regulated across the 3, and every one of them has an active USGS gauge on or near its stream.
Windows are typical-year climatology from each falls' driver, not forecasts. Live readings and percentile bands are USGS data, public domain; where a page says a river is above or below typical, that comparison is ours and is labelled. Access and safety belong to each falls' managing agency, named on its page. National picture →