0 ) ▁who ▁som etime ▁between ▁March ▁ 2 6 , ▁ 1 8 2 9 ▁and ▁April ▁ 6 , ▁ 1 8 2 9 , ▁along ▁with ▁guide ▁John ▁Turner , ▁and ▁a ▁brig ade ▁of ▁tra ppers , ▁travel ing ▁through ▁Mexican ▁California , ▁started ▁from ▁the ▁Pit ▁River ▁following ▁the ▁Cow ▁Creek ▁trail , ▁and ▁reached ▁the ▁Sac r amento ▁River . ▁Cow ▁Creek ▁is ▁Sac r amento ▁River ▁trib ut ary ▁that ▁runs ▁through ▁Pal o ▁C ed ro ▁and ▁serves ▁as ▁its ▁south ▁eastern ▁border line . ▁Mc Le od ▁had ▁been ▁sent ▁out ▁earlier ▁in ▁January ▁ 1 8 2 9 ▁from ▁Fort ▁V ancouver ▁to ▁find ▁the ▁orig ins ▁of ▁a ▁myth ical ▁Buen av ent ura ▁River . ▁After ▁crossing ▁the ▁Sac r amento ▁River , ▁Mc Le od ▁expl ored ▁and ▁tra pped ▁in ▁the ▁Sac r amento ▁Valley ▁as ▁far ▁South ▁as ▁present ▁day ▁Stock ton . ▁ ▁Upon ▁his ▁return ▁with ▁an ▁abund ant ▁supply ▁of ▁f urs , ▁he ▁camp ed ▁on ▁the ▁west ▁bank ▁of ▁the ▁Sac r amento ▁River ▁by ▁present ▁day ▁Anderson ▁in ▁December ▁ 1 8 2 9 . ▁ ▁While ▁attempting ▁to ▁cross ▁the ▁C asc ades ▁in ▁winter , ▁Mc Le od ▁was ▁met ▁by ▁a ▁snow ▁storm ▁at ▁the ▁head w aters ▁of ▁the ▁river ▁named ▁after ▁him , ▁Mc Le od ▁River ▁( Mc Cloud ▁River ), ▁he ▁lost ▁all ▁his ▁horses , ▁was ▁forced ▁to ▁cache ▁his ▁f urs , ▁and