▁river ▁flows ▁roughly ▁parallel ▁to ▁U . S . ▁Route ▁ 9 7 , ▁receiving ▁Spring ▁Creek ▁from ▁the ▁right ▁at ▁Col lier ▁Memorial ▁State ▁Park , ▁about ▁ ▁north ▁of ▁Ch ilo quin . ▁At ▁Ch ilo quin , ▁it ▁receives ▁the ▁Sp rag ue ▁River ▁from ▁the ▁left ▁at ▁about ▁river ▁mile ▁( R M )   1 1 ▁or ▁river ▁kilometer ▁( R K )   1 8 . ▁The ▁William son ▁enters ▁the ▁northern ▁end ▁of ▁Upper ▁K lam ath ▁Lake ▁near ▁Mod oc ▁Point , ▁about ▁ ▁north west ▁of ▁K lam ath ▁F alls . ▁ ▁W aters hed ▁ ▁At ▁lower ▁elev ations ▁along ▁big ▁streams , ▁the ▁William son ▁waters hed ▁supports ▁ir rig ated ▁past ures ▁and ▁other ▁far ml ands . ▁Liv est ock ▁gra zing ▁occurs ▁in ▁many ▁locations ▁in ▁the ▁bas in . ▁For ests , ▁often ▁cut ▁for ▁tim ber , ▁cover ▁about ▁ 8 1   percent ▁of ▁the ▁bas in ▁and ▁far ms ▁account ▁for ▁ 6   percent , ▁while ▁range , ▁wet lands , ▁water , ▁and ▁urban ▁areas ▁cover ▁a ▁combined ▁ 1 3   percent . ▁P reci p itation ▁in ▁the ▁bas in , ▁which ▁lies ▁in ▁the ▁rain ▁shadow ▁of ▁the ▁Cas cade ▁Range , ▁aver ages ▁ ▁a ▁year ▁along ▁the ▁William son ▁above ▁its ▁confl u ence ▁with ▁the ▁Sp rag ue ▁and ▁about ▁ ▁along ▁the ▁Sp rag ue . ▁ ▁Rec re ation ▁ ▁The ▁William son ▁is