Pocantico

The Pocantico can be paddled from just above the bridge where old sleepy hollow rd crosses the river below
Pocantico lake to the lower end of the cemetary above 9A. The Hagstrom westchester maps show the river pretty well.

http://www.google.com/maps?ie=UTF8&oe=UTF-8&hl=en&q=tarrytown,+NY&z=19&ll=41.104298,-73.846136&spn=0.000829,0.002108&t=k&om=0
This seems to be the area called the Ledges, something like the 'hard' section of New Boston on steriods, the slides and
ledges are bigger and the section longer. I would rate it at the very low water we saw as an easy IV. Thre is easy scouting or carry on the right. The rest of the river is class II, except one drop in the upper part of the cemetary section just after a walk bridge (see map) that is short but ugly.
There is a walk in- path with a footbridge just above the ledges at the point above where the river gets really close to Sleepy hollow road before bending away into the park. On river right upstream of the bridge is a wall remnant. This wall has a top cornice and below, cinder blocks. At the level we ran which has to be considered minimal there were 3+3/4 cinder blocks visible.

Blow-downs:
The river from the put-in up-river to the dam had several trees.
There was a river wide tree trunk comfortably below the ledges just before the hairpin left turn that could be boofed hard left although certain people felt it should be crossed as a group effort and made a party out of it.

After the next footbridge there is a big must carry tree trunk with vines but in flat water. R right was easier carry but left was doable.Jim said this was new in the last couple of weeks. It is rotten and cracked so it may not persist.

Immediately after the tunnel at the aqueduct crossing is a 50 foot section of log jams (must carry) (beaver dam?) There is an easy eddy on R at this level after the tunnel and a steep but passable carrry on river R.

We hiked up into the cemetary to take out, it looked like you could also take out more easily along Dell street on river left above 9A. The whole section along the cemetary was painfully bony at this level, the section above was shallow but OK.

More water could make things interesting in all ways. There are spots blow the ledges and the cemetary nasty drop that could be nice or not waves or holes at higher water. The cemetary drop may be easier with more water.

The whole area is filled with a rabbit warren of paths with a pretty consistant horse path nearby on river right most of the way.
Total time on the river was about 3 hours, with scouting and boat bumping over slow water.

One addendum- after the ledges and there is a point were the river splits around an island. The main flow and route goes left, at least at low water. There is a passable tree down just after the next right bend.