(Green Spring, 30' x 15', 20-21-A) across Green Spring SW of Clear Spring, District 4 Clear Spring Township, Washington County, MD. Big Spring Rd. S. 1.8 miles from jct with US40 in Clear Spring, W. on MD56 (Big Pool Rd.) 2.2 miles, S. on Mc Coys Ferry Rd. 0.5 miles to the bridge on the W. side of the road at 11014. (N39 36.932 W77 58.387) Photos by Bruce Nichols 6-13-10.