Starting at an elevation of about above sea level, Bull Run water flows by gravity from the headworks through three large pipes to an underground reservoir at Powell Butte Nature Park in east Portland. The pipes, above ground in places, are vulnerable to landslides, falling trees, earthquakes, and other hazards. In 2006, the Federal Emergency Management Agency (FEMA) granted $3 million to the city for seismic upgrades to pipes where they cross trestles above streams.