Emerson Run begins in a wetland in a broad and shallow valley in Covington Township.

It flows east for several hundred feet before turning north for a similar distance.

[4] The surficial geology in the vicinity of the lower reaches of Emerson Run consists mainly of Wisconsinan Ice-Contact Stratified Drift.

[3] Lake Run was entered into the Geographic Names Information System on August 2, 1979.

[7] Wild trout naturally reproduce in a reach of Emerson Run, as far downstream as the stream's mouth.