The lake is nestled on a set of prominent valleys and peaks and produces Crawford Creek which flows as one of many tributaries of the Middle Fork Foss River.

Self-issued Alpine Lake Wilderness permit required for transit within the Necklace Valley area.

[1] Crawford Lake replicates the geology of the ridges of Iron Cap Mountain and others that surround it with Permian volcanic rocks, Jurassic/Crustaceous sedimentary and volcanic rocks, with Tertiary granites and alluvium of recent age.

The ridges may have iode gold, lead-zinc and silver known as Iron Cap and Tooker-Leshud deposits.

[3][4] This King County, Washington state location article is a stub.