Just inland from the [Alki] point is a small hill of about 75 feet (23 m). This hill is one of the Seattle area’s few bedrock outcroppings, and possibly the only one outside of the Duwamish River valley. It constitutes a piece of the 23-million-year-old sedimentary Blakeley Formation.
On March 31, 2006, amateur radio operators from AMSAT in Germany tracked and received radio waves from Voyager 1 using the 20-meter (66 ft) dish at Bochum with a long integration technique.