Posts Creek
While not as steep as Sawmill Cr. this run will take some major scouting on the first descent. I only looked at the first 3 drops. Two were definitely runnable and the third ???. It is clear from aerial photos and other beta that there is at least one 20-25 ft. drop in the creek and a number of other substantial drops. Take-out access will also be an issue. But it should be exciting for whoever gets on it.
This shows the second and third drop after the put-in.
I would imagine that this would be at a runnable level if West Brook was at 400-600 cfs or above and on the rise.
You can park right at the put-in. There's a gravel trail access parking area. The trail goes about 30 yards right to the top of the first drop.
 

Take out will be an issue.
This runs into the Wanaque Res. which absolutely prohibits boating or trespassing. It looks like you will need to find a take-out point before you get to the res. and hike a half mile or more. (Bring your GPS, compass and a good map) There does seem to be a diversion dam about 200M from the Res. It looks like you might be able to follow the fence line or a small creek down to Doty Rd.?