might be close, but their baseline is small, so that doesn't represent nearly as much excess water as, for example, if the Duchesne or NE Uintas basins were at 200%. All of Utah's large water basins (Bear, Weber, Ogden, Provo, Duchesne, NE Uintas) are between 130% and 160% to start today so it would take a lot more than one storm to get those close to being back around 200%.

The good thing about CO basins being 120-135% though is that their baseline is really big (much bigger than Utah's large basins) so a 20-35% above normal reading from them represents a lot more excess water than if the large Utah basins were only 20-35% above normal. CO being 20-35% above normal will have a much bigger impact on Lake Powell water levels than Utah being 60-100% above normal because the vast majority of Utah's large basins end up in the GSL, not in Lake Powell.

You're of course correct that it'll take many years for Lake Powell to get back to capacity again.