High Quality Content by WIKIPEDIA articles! The Eureka is a side-wheel paddle steamboat, built in 1890, which is now preserved at the San Francisco Maritime National Historical Park in San Francisco, California. Originally named the Ukiah to commemorate the railway`s recent extension into the City of Ukiah, the boat was built by the San Francisco and North Pacific Railroad Company at their Tiburon yard. The Eureka has been designated a National Historic Landmark.