The National Part Service is planning to deepen Castle Rock cut on Lake Powell in order to shorten transit times when the water level is low. Not that relevant to most people perhaps, but if you look at the lake on Google Maps at two different zoom levels you can see the effect of the water level on the lake surface topography. Neat!
At this zoom level you can see Castle Rock cut submerged. The small, scorpion-tail island to the northeast of Wahweap is Castle Rock. When the water is high, boaters can go directly east from Wahweap to the northern parts of the lake.
This zoom level shows Castle Rock cut exposed. As you can see, boaters are forced to loop through that snake-like path to the south in order to access the eastern parts of the lake, which I'm told adds 12 miles and over an hour to the commute of many lake employees.
Here's an NPS brochure that explains the plans for deepening Castle Rock cut.
