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Aquapedia background February 11, 2014 California Water Map Layperson's Guide to California Water

Los Angeles River

The Los Angeles RiverThe Los Angeles River, looking north toward the confluence with the Rio Hondo River. Source: Los Angeles River Master Plan

The Los Angeles River is gradually being transformed from a giant, trash-strewn stormwater channel to a recreational and open space corridor that continues to provide flood control.

Deadly floods in the 1930s led the U.S. Army Corps of Engineers to straighten and pave nearly all 52 miles of the river channel in concrete. The trough was designed to keep flood water from destroying property, to manage the discharges from sewage treatment plants and to flush stormwater to the Pacific Ocean.

Since the 1990s, a grassroots campaign to restore some of the natural character of the river has gained political traction.

Los Angeles has the lowest ratio of open space per capita of any major American city, due to rapid growth and poor urban planning.

A bill passed by the state Legislature in 1992 established a Los Angeles River Conservancy to develop comprehensive planning strategies along the concrete corridor.

Additionally, a citizens’ group, Friends of the Los Angeles River, has helped coordinate the cleanup and rejuvenation of the river.

In the past, river advocates considered painting the river channel blue to give it a more natural look.

In 2010, the U.S. EPA deemed the river navigable and subject to the protections of the Clean Water Act. A year later, the Army Corps permitted kayaking along soft-bottom stretches north of downtown.

In 2014, the Army Corps recommended approval of Los Angeles County’s plan to restore habitat, widen the river, create wetlands, and invite new commercial and residential development. The county Board of Supervisors approved the Los Angeles River Master Plan in 2022.

In the winter of 2024, the river captured near-record precipitation from a series of intense atmospheric rivers, thanks to drain clearing and dredging of debris, Army Corps officials said.​

Los Angeles River supporters are looking beyond the river’s banks toward improved management of the Los Angeles River watershed as a whole. Advocates seek a strategy that integrates and coordinates the management of water quality, flood control and habitat restoration across jurisdictional boundaries.

Updated February 2024

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Aquapedia background February 11, 2014 California Water Map Layperson's Guide to California Water
Maps & Posters April 17, 2014 California Water Bundle

California Water Map
Updated December 2016

A new look for our most popular product! And it’s the perfect gift for the water wonk in your life.

Our 24×36-inch California Water Map is widely known for being the definitive poster that shows the integral role water plays in the state. On this updated version, it is easier to see California’s natural waterways and man-made reservoirs and aqueducts – including federally, state and locally funded projects – the wild and scenic rivers system, and natural lakes. The map features beautiful photos of California’s natural environment, rivers, water projects, wildlife, and urban and agricultural uses and the text focuses on key issues: water supply, water use, water projects, the Delta, wild and scenic rivers and the Colorado River.

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Publication May 20, 2014 California Water Map

Layperson’s Guide to California Water
Updated 2021

The 24-page Layperson’s Guide to California Water provides an excellent overview of the history of water development and use in California. It includes sections on flood management; the state, federal and Colorado River delivery systems; Delta issues; water rights; environmental issues; water quality; and options for stretching the water supply such as water marketing and conjunctive use. New in this 10th edition of the guide is a section on the human need for water. 

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