San Pedro Creek Watershed
The river has eight sources and three major tributaries, the Mid Fork, North Fork and South Fork. Draining a watershed of 8.2 square miles (21 km2), the lower portions of the stream were modified according to the local land uses, initially agriculture, and in the 1950s, suburban development. This involved straightening of the stream and elimination of wetlands and the reclamation of the former Lake Mathilda at the lower western zone with landfill. These changes, coupled with an increase of impermeable surface in the watershed has caused an increase in peak runoff levels, flooding and erosion of deeply incised channels up to 16 feet (4.9 m) deep. Most of the upper watershed is protected by San Pedro Valley County Park a 1,150-acre (4.7 km2) park which has three perennial creeks, the south and middle forks of San Pedro Creek, and Brooks Creek. During the rainy, winter months, a special attraction is the beautiful Brooks Falls, which has a drop of 175 feet (53 m) in three tiers.
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