Willow Creek is a short 1 to 2 kilometre stream which flows south from a small lake into Pine Creek about half-way between Atlin and Surprise Lake, approximately 8 kilometres northeast of the community of Atlin.

The creek was discovered in 1898 when gold was discovered on Pine Creek and was subsequently worked for four years recovering around 40,308 grams of moderately coarse gold (Bulletin 28). Only sporadic exploration drilling was done thereafter in 1937 and 1946.

The creek is underlain entirely by variably altered upper Mississippian to Permian ultramafic rocks of the Cache Creek Complex. The rocks are commonly altered to serpentine and are part of a northeast trending belt of ultramafic rocks extending along Pine Creek from Atlin to Surprise Lake.

There are two pay channels in the creek. The overburden consists of two gravel beds separated by a fine glacial silt to clay called "muck" by the old miners. Both pay channels are in the lower gravel, one right below the muck, and one on top of bedrock. The gold distribution in the channels is sporadic.