Did you know that steelhead and rainbow trout used to thrive in Arroyo Seco Watershed? These beautiful fish used to spawn in the upper reaches of the Arroyo Seco, swim to Pacific Ocean and then return to these streams of birth to spawn.
But that all stopped when Devil's Gate was built in 1920. This outdated dam provides no fish passage for ocean-bound trout and degrades trout habitat by trapping large amounts of sediment behind it. This sediment is an important element of trout habitat because it creates soft gravel beds, which are a key component needed for spawning. Devil's Gate Dam has effectively de-naturalized this process and caused drastic declines in the Arroyo Seco native trout populations.
It is now time to take a new comprehensive look at these facilities and their impacts and to develop a 21st-century program for sustainable stream and flood management. ASF aims to restore wild trout in the Arroyo and is working with County Public Works and the Corps of Engineers to restore habitat conditions in this major tributary of the Los Angeles River.
In spite of these formidable barriers and the long drought, we believe that there are still native trout in the Arroyo Seco. The goals of our monitoring project are to survey 12 miles of stream zone in the upper watershed of the Arroyo Seco and improve the conditions for native fish and other aquatic species.
This is an exciting opportunity to restore this habitat for trout populations in Los Angeles' backyard! We are calling on all nature lovers, hikers, fishermen and fisherwomen, mountain bikers and outdoor enthusiasts to assist us in our campaign to help these native trout thrive in our treasured watershed, the Arroyo Seco.