Boundary Dam Seattle City Power Camping Area in Washington offers beautiful views of the surrounding mountains and the Pend Oreille River. Nearby activities include hiking, fishing, kayaking, and swimming. The campground amenities include picnic tables, fire rings, potable water, and vault toilets. There are 15 campsites available on a first-come-first-serve basis. The best time to visit is during the summer months, with average temperatures ranging from the mid-70s to low 80s Fahrenheit.