What's the water level like coming down the rivers there? I'm not from the area, but looking on satellite views, there are what look like wetlands nearby, a shi

What's the water level like coming down the rivers there? I'm not from the area, but looking on satellite views, there are what look like wetlands nearby, a shipping channel going past. No reservoirs in the immediate area. I quickly googled and it suggests Sacramento pulls from the rivers and underground, SF gets its supply from Hetch Hetchy.