Yes, the mouth of the Escalante is at MM68, but I've measured the actual boating distance to Wahweap via the Cut--it's 54 miles if you take straight lines. If the lake is below 3605, add another mile or so to go the long way around Padres Butte since that small shortcut will be closed below that lake level. And the direct route to Bullfrog from the mouth of the Escalante is about 33 miles.
Boating distances to the mouth of various side canyons of the Escalante from the mouth of the Escalante are:
- Indian Creek – 1.2 miles
- Clear Creek – 2.1 miles
- Davis Gulch – 4.5 miles
- Fifty-Mile Canyon – 5.3 miles
- Willow Gulch – 7.4 miles
- Explorer Canyon – 10.0 miles
You won't be able to get as far as Explorer Canyon if the lake is below 3600, and it will be hard even when the lake is slightly higher because of sandbars.
One thing to note about 50-Mile Canyon. When the lake is below 3603, a sandbar across the canyon will stop further boating about 0.8 miles in from the mouth but becomes a nice houseboat camp spot. If you had a very small boat, you could drag it across the sandy beach/bar to the upstream side of this bar and continue for another mile or so, and you'd have this upstream area completely to yourself. When the lake is above 3603, boats can continue farther past that point, anywhere between 2 and 3 miles from the mouth of 50-Mile.
Beaches in the Escalante are rare, but there are good ones, including as noted previously, one right near the mouth on the right as you enter. But there are others too, depending on lake levels...