However, the upper reaches are relatively unimpacted by development and the wetlands at its headwaters are designated as Exceptional Value and are home to numerous amphibians.

It then heads in a westerly direction for several tenths of a mile before crossing Interstate 78 and entering Bethlehem, where it receives another unnamed tributary from the right.

Here, the creek continues flowing west, entering a deep, very narrow valley and passing near several railroad lines.

At this point it receives an unnamed tributary from the right and passes by the southwestern corner of Green Hill before turning west and reaching its confluence with Saucon Creek.

[5] The elevation near the mouth of East Branch Saucon Creek is 210 feet (64 m) above sea level.

[10] East Branch Saucon Creek passes through former Bethlehem Steel property north of Interstate 78.

However, most of the land in the vicinity of the creek south of Interstate 78 is densely forested with some rural residential development.

[8] East Branch Saucon Creek was entered into the Geographic Names Information System on August 2, 1979.

[15] A concrete stringer/multi-beam or girder bridge carrying State Route 2001 was built over East Branch Saucon Creek in 1930.

[16] In 2009, the Pennsylvania Department of Transportation made plans to paint a bridge carrying Raubsville Road over the creek in Lower Saucon Township.

[17] Around 2000, a number of vernal ponds on the south side of East Branch Saucon Creek were destroyed by site preparation for a new residential development.

[7] Historically, the 2 by 50 feet (0.61 by 15.24 m) Lower Saucon Sportsmens Association Dam was on the creek, but it was removed for safety reasons.

[20] In 2000, A. Joseph Armstrong observed in that there were no trout in East Branch Saucon Creek, and he doubted there would ever be.

[7] The Pennsylvania Department of Environmental Protection considers these wetlands to be Exceptional Value due to the presence of wild trout in the creek.