Joint Board of Directors of the Tri-Dam Project/
Commissioners of the Tri-Dam Power Authority
Oakdale Irrigation District Directors
Gail Altieri
Brad DeBoer
Herman Doornenbal
Tom Orvis
Linda Santos
South San Joaquin Irrigation District Directors
John Holbrook
Bob Holmes
Dave Kamper
Ralph Roos
Mike Weststeyn
Members of the Joint Board of Directors and Commissioners may be contacted through their
respective irrigation district offices.
Oakdale Irrigation District (209) 847-0341
South San Joaquin Irrigation District (209) 249-4600
Tri-Dam Project Staff
General Manager, Jarom Zimmerman
(209) 965-3996 ext. 120
JZimmerman@TriDamProject.com
Finance and Administrative Manager, Brian Jaruszewski
(209) 965-3996, ext. 123
bjaruszewski@tridamproject.com
License Compliance Coordinator / Tulloch, Susan Larson
(209) 965-3996, ext. 148
SLarson@TriDamProject.com
Maintenance Supervisor, Troy Hammerbeck
(209) 965-3996, ext. 194
THammerbeck@TriDamProject.com
Operations Supervisor, (Vacant)
(209) 965-3996, ext. 121