The Arroyo Seco is on the western edge of the City of Pasadena and extends 8 miles through the City. It is the City’s largest natural open space and physically described as a deeply cut canyon linking the San Gabriel Mountains to the Los Angeles River containing the intermittent stream for which it is named. The Arroyo Seco meanders south through the canyon and past various cities, joins the Los Angeles River, and continues on to the Pacific Ocean.

Arroyo Seco Trails Guide Now Available!

The Arroyo Seco Trails Guide, published by the Parks and Natural Resources Division of the Public Works Department, shows – and tells – you the best places to walk, hike, jog, ride a horse, bike, fish or picnic throughout the Arroyo Seco in Pasadena.

Map Side* (11x17" PDF)
Five page handout of accompanying information (8.5x11" PDF)
Reduced scale version of both sides* (11x17" PDF)
 

Hahamongna Watershed Park Annex

In 2005 the city purchased an additional 30 acres of land adjacent to Hahamongna Watershed Park, currently referred to as Hahamongna Annex. The land was purchased with the stipulation that future uses of this property must support open space and recreation. With community input, the city has prepared a draft plan that provides a vision for the future of this property that will be integrated into the existing Hahamongna Master Plan.

Draft documents of the Hahamongna Watershed Park Annex are now available for review.