The river is a very small limestone stream and flows in the vicinity of Lehigh University's Saucon Fields.

It passes through an unnamed pond and then turns east for several tenths of a mile, entering Lower Saucon Township in Northampton County.

[5] In April 1959, measurements of Black River near a private road 0.3 miles (0.48 km) from Wydnor found the creek's discharge to be 2.80 and 2.14 cubic feet per second (0.079 and 0.061 m3/s).

[1] The Black River is described as a "miserable ditch" in Trout Unlimited's Guide to Pennsylvania Limestone Streams.

[1] Black River flows in the vicinity of the Saucon Fields tract of Lehigh University's campus in some reaches.

[9][10] A concrete tee beam bridge carrying PS State Route 3004 over Black River was built in 1938 0.75 miles (1.21 km) west of Hellertown.

A prestressed box beam or girders bridge carrying State Route 3003 was built over the river in 1959.

[8] In 2006, Black River was identified as one of the places in the Saucon Creek watershed most in need of habitat restoration.