sentences:  Comparison of topographic maps from 1896 and 1939 illustrates the extreme modification in the lower reaches due to urban development from the rapidly expanding population.The San Bruno Creek watershed was originally settled by a tribe of the Ohlone, and later this locale was part of the Spanish missions' landholdings.A hiking trail winds along San Bruno Creek representing an important link in the San Francisco Bay Trail; in fact, this link is needed to make up for lack of access along a large bay front area occupied exclusively by San Francisco International Airport; thus, the Bay Trail must detour a full two miles inland from the bay to meet the San Bruno Creek Trail.