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Alaska has nearly 1 million miles of rivers, but only 10% of them are gauged, or measured.

By #TrackingWorldWater, SWOT will measure the height of surface water from space and help groups like the Alaska Department of Fish and Game better manage salmon spawning and survival.
#NASAEarth
in reply to NASA

There is misleading. Presumably this means that ~10 percent of rivers have one or more gauges, not that >100,000 "miles of river" are gauged.

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