Historically there was a USGS
gauge at Index (stn.
12134000, 1910-1948, 146 sq.
mi.). The virtual gauge for this run
provides approximate flow based on
the relative area of the basin and the
Goldbar gauge downstream. Keep
in mind that several tributaries come in
between this section and Index so
actual flows will be even less than that
indicated by this gauge. The
relationship used for the virtual gauge
is of course dependent on snow level.
When the freezing level is low the river
will be flowing a bit lower than the
value given and during peak snowmelt
the river may be flowing higher. The
Goldbar gauge is also available
through the NOAA hotline