In a gem of a piece, photographer Roberto (Bear) Guerra chronicles the species loss the LA River has suffered since being encased in concrete with photographs of specimens from the Western Foundation for Vertebrate Zoology and the LA County Natural History Museum.
An important photo essay as our city weighs the future of the river in terms of development and habitat restoration. A sample:

Western Toad (Bufo boreas) — Perhaps no animal is as emblematic of the decline of native species in the decades following channelization as the western toad. One of the neighborhoods adjacent to the soft-bottom Glendale Narrows section of the river is still known as “Frogtown,” for the swarms of young toads and Pacific treefrogs that hopped through the streets each year until the 1970s. Today, toads and frogs are rarely to be found.
See you on the river, Jim Burns
Lewis MacAdams is right!! I think that there is an iconic species for this river. If you bring back the steelhead, you solve many issues of the river in terms of ecology and beauty at the same time.
The current statement from Frank Gehry, that it is going to be a ‘hydrology project first, and then a beautification project’ seems to be the same level of logic that channelized the river in the first place – solving one problem. Also its a RIVER. Anyone who has been down into the Glendale Narrows can see that if you give it some freedom, it will naturally meander and create beauty that doesn’t need an architect to design or intellectualize it.
There are many examples of rivers that have been problems when cities built into their rain sheds. the South Platte through Denver always comes to my mind. It has hard edges and intersections with the city and has areas where it runs free and is natural. It also has monster carp and trout in these areas respectively.