Head of gradient

First off, all which follows is solely from what could be gleaned from online aerial recon of this stretch, along with topo analysis. As a result, take all info with appropriate caution. The following is not likely to be entirely accurate or complete.

Increased gradient actually starts about a half-mile upstream of the bridge. (Unknown how convenient it might be to get up there, nor weather there is really much reason to. It appears there may be gradient of about 65FPM in this half-mile, which may include a somewhat significant drop early on, but online-aerial view is greatly obstructed by trees -- perhaps the river is as well.)