▁ 1 ▁Power house ▁on ▁Mill erton ▁Lake . ▁In ▁ 1 9 8 3 , ▁the ▁ 1 5 5 ▁M W ▁Ker ck hoff ▁No . ▁ 2 ▁Power house ▁was ▁added , ▁bringing ▁the ▁total ▁capacity ▁to ▁ 1 9 3 ▁M W . ▁ ▁Stock ton ▁Sh ip ▁Channel ▁ ▁The ▁San ▁Jo aqu in ▁was ▁once ▁navig able ▁by ▁steam bo ats ▁as ▁far ▁up stream ▁as ▁F res no , ▁but ▁agricult ural ▁divers ions ▁have ▁greatly ▁slow ed ▁and ▁shall owed ▁the ▁river . ▁In ▁addition , ▁this ▁has ▁caused ▁the ▁river ▁to ▁drop ▁large ▁amounts ▁of ▁s ilt ▁that ▁formerly ▁was hed ▁out ▁to ▁sea ▁in ▁its ▁bed , ▁further ▁reducing ▁the ▁depth . ▁In ▁the ▁late ▁ 1 9 th ▁century , ▁the ▁city ▁of ▁Stock ton , ▁once ▁an ▁important ▁se ap ort ▁for ▁the ▁San ▁Jo aqu in ▁Valley , ▁found ▁itself ▁increasing ly ▁land locked ▁because ▁the ▁San ▁Jo aqu in ▁River , ▁its ▁main ▁connection ▁to ▁the ▁sea , ▁was ▁rapidly ▁sil ting ▁up . ▁The ▁early ▁ 2 0 th ▁century ▁saw ▁propos als ▁to ▁maintain ▁a ▁minimum ▁depth ▁in ▁the ▁lower ▁river ▁by ▁d red ging , ▁but ▁these ▁were ▁interrupted ▁by ▁the ▁on set ▁of ▁World ▁War ▁I . ▁In ▁ 1 9 2 5 ▁the ▁city ▁put ▁forth ▁a ▁$ 1 . 3 ▁million ▁bond ▁for ▁d red ging ▁the ▁lower ▁San ▁Jo aqu in ▁from ▁its ▁mouth ▁to ▁the ▁Port ▁of ▁Stock ton ▁– ▁a