Sweetwater Reservoir – Birding Location Question?

Where is the best location and access for birding at Sweetwater Reservoir?  I see eBird lists for great numbers of species and individual birds, so I went last week, but only saw 11 species.  I didn’t find any access on north side, and ended up at the “fishing parking lot” near south west side of lake.  I’m game for hiking if required. 
Any clues would be greatly appreciated.
Thanks!
Nancy Stalnaker
San Diego

My checklist:

https://ebird.org/checklist/S131706415