Cooper's Rock State Forest

http://www.coopersrockstateforest.com/ 

Waterfall on Scott Run Trail
Length: 2.5 miles. Walking time: 2 hours
Blaze: Yellow
Difficulty: Moderate/Steep  
The trail begins near the forest entrance parking area and ending at the McCollum camping area.  Not much of a waterfall but a nice area to hike.

Image from Google Earth

http://www.physics.arizona.edu/~milsom/index.html

Professor John A. Milson, Physics Prof. at University of Arizona, offers these photos of Clay Run and Hemlock Trail.