Hahamongna is the 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.


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.

Sample Comments

WAYS TO SUBMIT COMMENTS:

BY EMAIL -
reservoircleanouts@dpw.lacounty.gov (Include "Devil's Gate Reservoir Sediment Removal and Management Project" in the subject title)

BY MAIL -
Gail Farber, Director
Los Angeles County Department of Public Works
Attn: Water Resources Division - Reservoir Cleanouts
P.O. Box 1460
Alhambra, CA 91802-9974


Hahamongna Updates


Search the Arroyo News Database for a relevant topic like sediment or Devil's Gate




Devil's Gate EIR Toolkit

Here you will find tools to give your information and background to help you prepare your comments for the Devil's Gate Environmental Impact Report. We are now in the public comment phase of the Draft Environmental Impact Report review, assessing the adequacy of the EIR analysis. We will be adding additional material, so check back regularly for new resources and to view the public comments.


Basic Instructions

EIR Process

Devil's Gate Dam

Arroyo Seco Flood Timeline  History  Reservoir Map  Dam Elements

Devil's Gate Sediment History

Sediment Management

Sediment Analysis - 1980   US Forest Service 'It All Flows Downhill'

Philip Williams Hahamongna Sediment Study - 2000

A New Paradigm (slides)   A New Paradigm (video)

CA Alluvial Fan Task Force  CA Coastal Sediment Management Workgroup

Why Hahamongna Is So Special

Hahamongna Master Plan

Habitat Wildlife News Wetland Plant Species found at Hahamongna

The Birds of Hahamongna

Ecosystem Assessments of Hahamongna Watershed Park

Habitat Assessment of Hahamongna 2012 Arroyo Seco Watershed Assessment - 2011

USACE Arroyo Seco Watershed Ecosystem Restoration Feasibility Study

County Environmental and Planning Documents

Draft Environmental Impact Report (October, 2013)

DEIR Alternatives

LA County Sediment Management Strategic Plan

EIR Notice of Preparation - Sept. 28, 2011 EIR Initial Study Project Description

Original Presentation – November 2010 Biological Survey Short Term Solution

Interim Measures Public Scoping Comments - November 2011

How to Write An EIR Comment

Californians for Responsible High Spread Rail

How to Comment on a CEQA Document - Fremontia CEQA - Wikipedia

WAYS TO SUBMIT COMMENTS:

EIR Draft Review Meetings - Speak at the public meetings.

EMAIL - reservoircleanouts@dpw.lacounty.gov (Include "Devil's Gate Reservoir Sediment Removal and Management Project" in the subject title)

WRITE -
Los Angeles County Department of Public Works
Attn: Water Resources Division - Reservoir Cleanouts
P.O. Box 1460
Alhambra, CA 91802-9974