It joins the Agiapuk River in a broad, gravel-filled basin, and for 20 miles (32 km) up, is characterized by a wide flood plain and a meandering course.
The river is easily navigable by small boats for several miles above the mouth of Portage Creek, and the region can also be reached from Teller.
It then turns southwards and flows in a comparatively deep valley for 10 miles (16 km) to its junction with the American River.
Through the last 0.5 miles (0.80 km) before entering the American River, a broad flood plain is developed within which the creek has a very sinuous course.
The bed rock on Budd Creek is composed of crystalline limestones, calcareous mica-schists, and graphitic schists, usually striking in a north–south direction, and having dips varying from 0° to 70°.
In its lower course, Igloo Creek meanders over a broad flood plain from which the hills rise by very gentle slopes to the flat-topped upland.
[1] This article incorporates text from this source, which is in the public domain: A. J. Collier's "A Reconnaissance of the Northwestern Portion of Seward Peninsula, Alaska" (1902)