No Big Dig Hearing - Mar. 23, 9:30 am

Superior Court of Los Angeles - Stanley Mosk Courthouse, 111 N Hill St #834, Los Angeles

The Honorable James C. Chalfant will rule on Arroyo Seco Foundation & Pasadena Audubon Society v. County of Los Angeles. He has tentatively found that the environmental impact report for the Devil's Gate Sediment Removal Project is critically flawed regarding air quality and mitigation measures. At this hearing he will consider additional information on the cumulative impacts of the Flood Control District's massive sediment mining and trucking project in Hahamongna Watershed Park and determine whether the County Supervisors will have to reconsider the Big Dig project and its impacts.

February 2017 Hearing

No Big Dig Update  |  Factsheet  |  Contact Supervisors


Endangered Birds Spotted in Hahamongna

April 26, 2016 — The recent discovery of a pair of Least Bell's Vireo, a federally endangered bird found only in wetland areas, could throw a monkey wrench in the County Flood Control District's plans to excavate the Hahamongna basin. Another federal endangered species, the burrowing owl, has also recently shown up. The Flood Control District's environmental documentation largely ignored recorded sightings of the federally listed endangered species as well as California species of special concern, namely the yellow warbler and the yellow-breasted chat. "These recent sightings should really focus the regulators on the importance of protecting critical habitat like Hahamongna and enforcing the Endangered Species Act," said Mitchell M. Tsai, attorney for the Arroyo Seco Foundation and Pasadena Audubon in the No Big Dig Lawsuit.

County Flood Announces Three Community Meetings on Habitat Restoration

June 30, 2016The Flood Control District is holding three meetings trying to sell their habitat restoration program to the community. Do not expect them to answer some key questions about the Big Dig:

Supervisor's Race Could Be Key to Hahamongna's Future

September 16, 2016 - The candidates to replace Supervisor Mike Antonovich addressed the County's Big Dig program for Hahamongna at a debate last night at Pasadena City College. The debate was sponsored by the League of Women Voters, Pasadena City College and the Pasadena Chamber of Commerce. The candidates responded to a question from the audience that raised concerns about the enormous impacts of the Flood Control District's sediment removal program from the Devil's Gate Dam area in Hahamongna Watershed Park.


Lawsuit Campaign Soars Beyond Goal

February 15, 2015 —Thank you to the 187 and counting Hahamongna supporters who have made our Indiegogo campaign, No Big Dig - the Lawsuit to Save Hahamongna, an overwhelming success. As of the February 5, 2015 deadline, we exceeded our goal by 34%, with a total of $33,566 raised. You made this happen!

The Indiegogo campaign funds will help cover our legal expenses as the Arroyo Seco Foundation and Pasadena Audubon Society take on the County's horrendous plan for Hahamongna and our neighborhoods.

Support the Lawsuit to Save Hahamongna!

We need grassroots support to defeat the County's horrendous plan for Hahamongna and our neighborhoods. Please give generously and share this information with your friends, associates and social media.


For more information about No Big Dig and a great video about Hahamongna, please go to:

No Big Dig! Lawsuit Update

March 2015 —Attorneys Mitchell M. Tsai and Christina M. Caro filed the lawsuit against the Los Angeles County Flood Control District on December 11, 2014. After that, the hard work began, painstakingly going through the extensive administrative record and monitoring the regulatory permitting issues and process.



The DEIR Comments Are All In

See What People Had to Say

Dessi Says: "Save the Habitat of Hahamongna!"

My name is Dessi Sieburth and I am 11 years old. I have been with Pasadena Audubon Society for 3 years. I like to watch birds especially in the Hahamagna watershed, and I have seen over 60 species of birds in Hahamagna. I am here to speak against the sediment removal project of LA county. If we remove the sediment the bird's habitat will be destroyed. An endangered species, the Bells Vireo was seen and might be nesting in Hahamagna. I saw rare birds at Hahamanga such as Indigo Bunting, Lewis's Woodpecker, and Vesper Sparrow. If we destroy the habitat these birds will not come back. Please save the Habitat of Hahamagna!

(signed) Dessi Sieburth

Pasadena Council Adopts Sediment Recommendations

On Monday, May 12, the Pasadena City Council unaminously adopted the recommendations of the Devil's Gate Sediment Working Group. This group was established by Pasadena to develop a more sustainable alternative to those presented in the LA County Flood Control District's Draft Environmental Impact Report on the Devil's Gate Sediment Removal and Management Project.

The Sediment Working Group's recommendations, if adopted, would substantially reduce the scope and negative impacts of the Flood Control District's program, while protecting the neighborhoods and rare environmental values of Hahamongna Watershed Park and the Arroyo Seco.

Recommendations of the Sediment Working Group  Council Agenda Report

Sediment Working Group Slides  SGV Tribune Endorses Pasadena Plan

County Unveils $100 Million Plan to Destroy Region's Most Valuable Habitat

Find Out What You Can Do  Key Meetings Coming Up

County Releases Massive Mining & Trucking Plan for Hahamongna

LA County Flood Control District has released their final environmental impact report on the sediment removal program for Devil's Gate Dam in Hahamongna Watershed Park. It's an old-style mining and trucking operation with devastating impacts on the nature and character of Hahamongna Watershed Park and on the surrounding communities.

Flood Control Releases Final EIR

LA County Flood Control District released the final Environmental Impact Report for the Devil's Gate Sediment Management Program in Hahamongna Watershed Park on October 20 and then rushed the program to the Los Angeles County Supervisors for their review and approval on November 12. Bucking overwhelming opposition, the Flood Control District held a series of three pro-forma public meetings to allow the public to comment on the Flood Control District's plan, but that was hardly enough time and opportunity to comment intelligently on a massive 7,864 page document.

To say the final EIR is a disappointment would be a historic understatment. As predicted, the Flood Control District selected one of their previous "alternatives," making only minor concessions to Pasadena and the 250 commenters who raised concerns about the $70-100 million sediment trucking program.

Supervisors Approve Devasting Plan
to Destroy Hahamongna Habitat

November 14, 2014 - Plus: Dust, Noise, Air Pollution, Traffic Jams, Trails Closed!

Star News: See You In Court!

Supervisors Approve Devasting Plan
to Destroy Hahamongna Habitat

Plus: Dust, Noise, Air Pollution, Traffic Jams, Trails Closed!

ASF, Pasadena Audubon Challenge The Big Dig!

The Arroyo Seco Foundation and Pasadena Audubon have stepped forward to take on LA County Flood Control District's Big Dig program for Hahamongna Watershed Park.

Lawsuit Announced  Support the Lawsuit


EIR In Preparation

LA County Flood Control District is now considering what alternatives there are for their massive sediment removal and management program at Hahamongna. County staff expects to release a draft of their environmental impact report next Fall. We will keep you informed of developments, so check back here regularly or sign up for updates.

County Releases Horrendous Plan for Hahamongna

Get the facts on the County plan on this website and on this factsheet: Fact Sheet

Here is the County's news release on the Devil's Gate Sediment Removal and Management Plan: Official Notice