The Dead Diamond River is formed in the township of Atkinson and Gilmanton Academy Grant, New Hampshire by the juncture of the Middle Branch and the East Branch of the Dead Diamond.
Nearly the entire length of the river is in Pittsburg, with a small portion at its southern end in the Atkinson and Gilmanton Academy Grant.
The river flows east into the Atkinson and Gilmanton Academy Grant, where it is joined by its west branch.
The river then turns south and flows parallel to the East Branch of the Dead Diamond, finally joining it in the Atkinson and Gilmanton Grant, less than one mile upstream from the confluence of the East Branch and the West Branch of the Dead Diamond.
The river flows northeast into the Atkinson and Gilmanton Academy Grant, then joins the Little Dead Diamond in the Dartmouth College Grant.
Flowing southeast, it passes through a corner of the town of Pittsburg before joining the Dead Diamond in the Atkinson and Gilmanton Academy Grant.
The river, never larger than a brook, flows northeast into the Atkinson and Gilmanton Academy Grant, where it joins the Little Dead Diamond River.
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