ok, I researched a bit, and classed my suspects into groups based on breeding information:
1.)Native to Olympic Peninsular Area, No Aquatic Larval Stage:
Ensatina [Oregon, Painted ssp.] (Ensatina eschscholtzi)
2.) Native to Olympic Peninsular Area, Breeding Habits Unknown:
Cope's Giant Salamander (Dicampton copei)
Dunn's Salamander (Plethodon dunni)
Larch Mountain Salamander (Plethodon larselli)
Washington Van Dyke's Salamander (Plethodon vandykei)
3.) Aquatic-Breeding Salamanders of the Olympic Peninsular Area THAT LAY IN WINTER:
Rough-Skinned Newt [Crater Lake and Northern ssp.] (Taricha granulosus)
Flatwoods Salamander (Ambystoma cingulatum)
Northwestern Salamander [Brown and British Colombian ssp.] (Ambystoma gracile)
Long-toed Salamander [Western, Eastern and Northern ssp.] (Ambystoma macrodactylum)
Blotched Tiger Salamander (Ambystoma tigrinium melanostictum)
Dunn's Salamander (Plethodon dunni)
Western Red-backed Salamnder (Plethodon vehiculum)
4.) Native to Olympic Peninsular Area, Fully Aquatic, Gills Retained Entire Life:
Cope's Giant Salamander (Dicampton copei)
5.) Olympic Peninsular Area, DOES NOT BREED IN WINTER:
Olympic Salamander (Rhyacotriton olympicus)
Pacific Giant Salamander (Dicampton ensatus)
Ensatina [Oregon, Painted ssp.] (Ensatina eschscholtzi) NO AQUATIC LARVAL STAGE
Start narrowing it down, Buddy.

Frogs and Toads coming up next...
Dieselhybrid