The California Department of Fish and Wildlife (CDFW) has executed a major amendment to
Streambed Alteration Agreement number 1600-2014-0014-R6 [Revision 2], pursuant to section 1602 of the Fish
and Game Code to the project Applicant, The Metropolitan Water District of Southern California. The Lake Mathews
and Cajalco Creek Dam and Detention Basins Long-term Routine Maintenance Project includes the long-term,
ongoing routine maintenance of ten (10) existing facilities at Lake Mathews, including: the Cajalco Creek Dam and
Detention Basin, Lake Mathews Sediment Basins 1-4, underdrain, North and South spillways, and two weirs (Weirs
1 and 2).
The amendment corrects and replaces a major amendment executed by CDFW on November 1, 2021 and includes
a revision of the project description for the maintenance of the Cajalco Creek Dam and Detention Basin (CCDDB).
Specifically, the amendment includes the removal of the phasing requirement for routine maintenance of the
CCDDB. The original Agreement allows for the annual sediment and vegetation removal of 2.65 acres, this acreage
is revised to 6.91 acres (annually).
This is to advise that CDFW, acting as a Responsible Agency, approved the above-described project on November
12, 2021 and has made the following determinations regarding the project pursuant to California Code of
Regulations section 15096, subdivision (i):