We hear and sometimes see these annual cicadas commonly in the summer from about 2,000 feet up to around 6,000 feet in the Olympic mountains. Cicadas are the largest true bugs (Order Hemiptera). Compare the shape to the tiny Psyllid Plant Bugs.
All of these photos and the sound recording come from the Hurricane Hill area of Olympic National Park.
Thanks to Andy Hamilton at bugguide.net for the identification. (See bugguide.net images)
Cicada nymphs live in the ground or under objects on the ground. Mark Leppin has some excellent photos of an Okanagana sp. nymph on bugguide.net. (See Okanagana nymph)