Below the mouth of Melsing Creek, the valley broadens out and merges with that of Fish River, to which the Niukluk is a tributary.

In Niukluk River itself, gold was found at its head, though most abundant below the mouth of American Creek.

Below the mouth of Ophir Creek the river has cut a small rock canyon 50 feet (15 m) below an old valley floor, leaving broad benches on either side.

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