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.' "..... . . ..-.; v ~. . '. i . JOB COMPLEtION R~PORT INVESTIGATIONS PROJt:C'l'S State of: liE.lLm: X I CO PrOject No.: F.19-D-4 Name: State.,..,inp. Rough }<.i.c;h Control Job No.: ~-16-4 Tit 10: Rehab; 1; tati ~n of the San Juan Riv!:.t .lnJ.l:.O.l:l.u.cJ;J..Qn: Tha San Juan River, located in tha northwest corner of New Mexico, is 8. major tributa.ry' of the Colorado River. It originates in the rugged San Juan Nountsins in Colorado, enters New Mexico nesr Rosa. and flows approXi.ma.tcly 90 miles through tha sta.te before re-entoring Colora.do. The Ha.vajo, Piedra, Pine and Anima.s Rivers a:ce the ma.in tributaries of the San Juan River. The Anilll$s River was not included in this pt'oject since it enters the San Jusn River below the Navsjo Oem. As a rosult of. the Upper Colora.do River Storage program the Navajo 0,"Ull Wa.s proposed for the San Juan River a.nd is now under construction, approxima.tely 14 mi lea northeast of Blanco,. Now Mexico. The construction wi 11 be completed by Septam- bnr 1962, however, water impoundment.will start during the spdng of 1962. The purpose of this rehabilitation project was to eliminate the present tra.sh fish populations in the San Juan River end tributa.ries upstream from the d8nl site. Since the waters impoundod by the Navajo D.,m will extend into ColoradO, both states ",oopora.ted with this project. This report will include only the New Mexico pOl:"tiol1 of the pt'oject. Our portion of the rehabilitation project included 15 miLns of the Pi ne Ri.ver, 30 mUes of the San Juan River, and approximately six miles of the Navajo Rivor. A total of .51 miles of wa.te1:"S wa.S treated. When the project W;9S initia.tecl, tho possibility existed of having nM.riy 20,000 acre-feet of wa.ter impounded by the beginning of the rotenoning. This po~sl.bj.bility could not be disregarded, the,'eforc, the initial planning included this volun1o of we.ter a.S a. part of the project. .1'ho rehs.bilita.lion project started September 7, 1961. There wa.s nO wa.ter im- pounded at this timo, so one phaso of the project was eliminated. 1.e.\:lUl1.qulla: 1.iquid Noxfish with five percent active rotenone ingredients was used. Stream flolJS wen> dotermined and the amount of rotenone requirnd wa.a calc.ulated. Tho rotenone was applied S.t three different points along both tha San Juan a.nd 1'ine Rivers. The upper sta.tion on the Pino River was located at the Colorado-New Mexico state line near La. Boca., Colorado. '\'ho second !lnd thi rd stations were located F-19-D-4, Job No. C-16-4 .1- ~~ f:~ - ._ ... ... - '-.. T ~ .-, .