[1] The stream flows primarily to the southwest and empties into the Coldwater River in central Carlton Township at 42°42′50″N 85°13′41″W / 42.71389°N 85.22806°W / 42.71389; -85.22806 (Little Thornapple River (mouth)).

[1] The Little Thornapple, with Jordan Lake tributaries, forms an important part of the upper Coldwater River watershed.

[5][6] The Little Thornapple is considered to form the headwaters of the Coldwater River.

[7] Lake Jordan is fed primarily by the outflow of Tupper Lake,[8] which in turn is fed by Tupper Creek[9] all in Odessa and Sebewa townships in Ionia County.

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