I actually work for the Coachella Valley Water Dist. I'm their Irrigation Water Specialist and the Crew Chief for the Supervisory Control Rm. our SCADA control room. 27 yrs. now.
The pump station at the Hayfield exit is Hines... which is on Metropolitan Water District's Colorado River Aqueduct... the one you want to see is Eagle... it's around the corner to the east. I've never been there... I've got an old co-worker who works there and a current co-worker who has toured it... he says it's an amazing work of art. Well kept.
Like I said I might do a driveby poke my head around & take some picts. I promised the boy we'd go camping...
If you ever need any info. on the area east of Indio to the river & south to Mex. let me know... been here aloooong time.