Aspen has provided a variety of environmental services to the USACE for the Santa Ana River Mainstem Project. The Santa Ana River Mainstem Project is a major flood control project spanning 75 miles along the Santa Ana River – from the upper canyon in the San Bernardino Mountains downstream to the Pacific Ocean at Newport Beach.

Western Area Power Administration and Aspen developed an EA (which mirrors an MND in many respects) and seven operation and maintenance (O&M) Plans and procedures in response to proposed changes in O&M procedures within Western’s Central Valley Project and Pacific AC Intertie ROWs and the Transmission Agency of Northern California’s (TANC) California-Oregon Transmission Project ROWs.

Because the potential for flooding along the Santa Paula Creek channel is considered life threatening, the USACE began construction of the flood control channel at Santa Paula Creek in June 1997.