Here's a way for part of the Youghiogheny River, as well as some riverbank tidying for it.

Align part of the Fayette/Somerset county border to USGS DRGs.

Youghiogheny River Lake.

Road alignments in Garrett County.

Cranesville Road alignment.

A little more of Western Run.

A little more of Western Run.

Here's the rest of the Blackrock Run watershed.

More of the Western Run watershed: most but not all of the Blackrock Run watershed. (I wanted to get all of it, but it doesn't look like I'll finish tonight, so here's what I have so far.)

Fix two things that have been bothering me for a while: Texas Station Court shouldn't be a tertiary road because it doesn't go anywhere; and Old Padonia Road does not in the slightest end in a mini roundabout.

Access permissions for parking areas in Timonium.

Stuff around the Welcome Inn.

This should undo some incorrect assumptions I made about the number of tracks at various points along the Northeast Corridor in Harford County when the USGS Ortho imagery was unavailable and all I had was Bing.

Power line cleanup around APG, including deletion of some lines that appear to have been taken down (!), plus a little Amtrak and APG boundary alignment.

More details at Perryman Generating Station.

Alignment tweaks on part of the Northeast Corridor, cleaning up some no-longer-existant railroad spurs at APG, some details at a power substation near APG.

More of Western Run and its feeders.

Extend Western Run a little further and add riverbank for some of Beaver Dam Run.

Road alignments in Towson.

Merge duplicate GNIS nodes.