Hahamongna is that rare spot in the Arroyo Seco at the foot of the San Gabriel Mountains where the mountainous watershed meets the urban plain. Periodically floods roar into this basin. Bounded on the north by the mountains and Jet Propulsion Laboratory and on the south by Devil's Gate Dam, Hahamongna contains five unique habitat zones that only exist in alluvial canyons near the mountains. Most sites like this in Southern California have been destroyed.

Don't let Hahamongna go the way of other lost environmental treasures in Southern California.


Witness the Winter Storms in Hahamongna

Winter 2009

December 2010 Storms

Is this anyplace to put soccer fields?


The Meaning of Hahamongna

The original settlers of the region were sometimes called the Hahamongna Indians. The word means "Flowing Waters, Fruitful Valley" in the native Tongva language.


July, 2010 - Council Eliminates One Soccer Field, Proceeds on Second

Council Action

Save Hahamongna is a campaign of the Arroyo Seco Foundation and other local organizations and concerned residents who are working to protect and preserve the nature of Hahamongna. We invite you to join us.

The Significance of Sediment EIR

County Supervisors on March 1, 2011 instructed County Public Works to conduct a full environmental impact report on the sediment management program at Devil's Gate Dam and Hahamongna in the Arroyo Seco.

Sups Approve EIR

Emergency Measures Completed

County crews completed the emergency measures at Devil's Gate Dam in late 2011.

Emergency Measures


View the Walkabout Videos Here

Hahamongna Walkabout 2012


Environmental Toolkit for County Project


Devil's Gate Sediment


JPL Parking Lot To Go

JPL Parking


A New Paradigm for Sediment Management



Hahamongna Updates



The Trucks Are Coming



La Cañada Alert

La Cañada

Dangers of Diesel

Diesel


A Strategy to Save Hahamongna

Strategy

Pasadena: Move Soccer Field to Muir

Pasadena officials are now developing a proposal to eliminate plans for an additional soccer field at Hahamongna Watershed Park and to instead dramatically upgrade a rundown softball field at nearby Muir High Schoolin Northwest Pasadena. This would be a win/win for everyone involved, expanding recreational opportunity while protecting Hahamongna.

We urge Hahamongna activists and organizations to support the Muir Plan.

Write A Letter of Support

ASF Wins $3.3 million for Hahamongna

The Arroyo Seco Foundation (ASF) has secured $3.3 million in state funding to improve water reliability and environmental conditions in Hahamongna.

The funding will be used to improve water facilities and environmental conditions in Hahamongna Canyon north of the JPL Bridge.

$3.3 Million for Hahamongna

Click on the Image

Haha Scoping: Public Says Keep It Natural.

Scoping hearings were held on July 12 and 14, 2012 to take public input on the environmental review of Pasadena's plan for a soccer field, expanded parking and other "improvements" to Hahamongna Watershed Park. Pasadena's plan includes filling in 27 acres of riparian, wetlands and buffer habitat to develop an athletic field and parking lot and relocatin the disc golf course in Hahamogna Watershed Park. Participants in the two scoping sessions were universally opposed to any changes that would degrade the natural character of Hahamongna.

Since the Summer of 2012, the Los Angeles County Flood Control District has been considering concerns and evaluating options for the sediment management program. They now expect to release their proposal plan and environmental impact report in May, 2013.

We urge all who love Hahamongna to stay involved in the environmental review process and work to Save Hahamongna.

Read the Coverage in the Pasadena Sun

Arroyo Moonrise (in Hahamongna Park) Original 18 x 24 oil painting © 2012 Karen Winters. KarenWinters.com

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.

Hahamongna Updates

Threats to Hahamongna

It's the most precious enviromental zone in our region, but it's under attack again. There's no question about it: 2011 will be a year of decision for Hahamongna.

A massive sediment and habitat removal program of the County of Los Angeles threatens to strip the basin of its rare riparian and alluvial scrub habitat

Sediment

Pasadena is forging ahead with an ill-conceived plan to add a parking lot and a soccer field to the center of the basin.

Soccer

There's going to be a lot of action this year. We urge you to become informed about the issues and to get active to save this environmental treasure.

This site will keep you up to date on the latest developments in the campaign to preserve the natural richness of the area.