, ▁U . S . ▁Route ▁ 9 9 , ▁and ▁now ▁Inter state ▁ 5 . ▁ ▁Geography ▁The ▁highest ▁point ▁of ▁the ▁pass ▁is ▁near ▁the ▁north western - most ▁corner ▁of ▁Los ▁Angeles ▁County , ▁north ▁of ▁G orm an . ▁Its ▁highest ▁point ▁is ▁ ▁or ▁ ▁( the ▁difference ▁ar ises ▁from ▁the ▁alt itudes ▁of ▁Inter state ▁ 5 , ▁and ▁both ▁Peace ▁Valley ▁Road ▁and ▁G orm an ▁Post ▁Road ▁that ▁run ▁next ▁to ▁the ▁fre ew ay ▁at ▁the ▁pass ' ▁a pe x , ▁respectively ), ▁ ▁north west ▁of ▁dow nt own ▁Los ▁Angeles ▁and ▁ ▁south ▁of ▁B akers field . ▁ ▁The ▁route ▁of ▁Inter state ▁ 5 ▁wind s ▁through ▁Te jon ▁Pass ▁( the ▁highway ' s ▁highest ▁point ▁in ▁the ▁state ), ▁connecting ▁the ▁southern ▁part ▁of ▁the ▁state ▁with ▁the ▁San ▁Jo aqu in ▁Valley ▁and ▁the ▁north . ▁ ▁The ▁pass ▁has ▁a ▁grad ual ▁rise ▁from ▁its ▁southern ▁approach ▁of ▁ ▁at ▁Santa ▁Clar ita , ▁but ▁a ▁precip it ous ▁descent ▁through ▁Gra pe v ine ▁C any on ▁toward ▁the ▁San ▁Jo aqu in ▁Valley ▁on ▁the ▁north , ▁where ▁it ▁ends ▁at ▁Gra pe v ine ▁at ▁. ▁ ▁On ▁its ▁north ward ▁slope ▁lies ▁Fort ▁Te jon ▁State ▁Historic ▁Park , ▁the ▁site ▁of ▁a ▁former ▁U . S . ▁Army ▁post , ▁first ▁g arrison ed ▁on ▁August ▁ 1 0 , ▁ 1 8 5 4 . ▁ ▁History