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<br />Date Time io Minutes
<br />June 5 " " " '" " 60 80 100 120 180 180
<br />15 ,'5 .n .SO 1.08 1.49 1.74 1.88 2.23 2.59 2.64 3.29 3.33
<br />16 ,27 .35 ,32 .;5 .n ."' ," 1.07 1.09 1.09 1.14 1.14
<br /> .
<br />" ,46 .67 ,32 1.24 1.81 2.04 2.81 3.1l 3.67 3.86 4.22 4.51
<br />
<br />below t~is tributary. Generally, all ri~~t bank tributaries below
<br />Jo~n Martin Dam contributed record peaks. The inflow ~ydrograp~ to
<br />Jo~n Martin Reservoir is sh010lll on plate 10.
<br />
<br />The airport recorder near the center of t~e storm ~ad a total stor~
<br />rainfall of 10.35 inc~es. ~Supp1emental rainfall reports from locations
<br />near Raton indicated t~e following total storm amoWlts: Raton 16 SW,
<br />13+ inc~es; Raton 5 S, \I inc~es; and Raton 14 W, 1I+ inches. The south~
<br />eastern portion of Colfax County had less than two inches of total storm
<br />rainfall.
<br />
<br />b. Xancac.- Flooding in Kansas was confined to areas along
<br />t~e ..ain sum of the Arkansas River. The flood was generated entirely
<br />in the dr~inage area between John Martin Dam and the Colorado-Kansas
<br />State line. Peak discharges for the Arka.nsas River and trib...taries
<br />where determinations have been ",ade are shown on plate 11 and a summary
<br />of peak staRes and discharges is presented in table 3.
<br />
<br />b. ""l'4 Rival' r.!awl'8had.-
<br />ceived an estimated 12 inc~es of rain
<br />Other areas in the ~atershed received
<br />fall during the period.
<br />
<br />The upper MOra River water~hed re.
<br />basedonstTea1llflowobservations.
<br />from two to eight inches of rain~
<br />
<br />c. New Mexico.. Western tributaries of t~e Canadian River
<br />i~mediately above Concha~ Reservoir produced a major flood on 15 June.
<br />The same streams and those in the headwaters of the Canadian River were
<br />in flood stage again on 17 and 18 June. The stage near Sanche~ on
<br />18 June was three feet hig~er than that of IS JWle, 10.2 feet higher
<br />than the maximum previous stage during the 33 years of record, and the
<br />highest in at least 100 years. The combined runoff of these floods,
<br />214,000 acre-feet, waS completely controlled by Conchas Reservoir.
<br />Only minor inflows occurred below the dam. Measured peak discharges
<br />for the Canadian River and its tributaries are shown on plate 12 and
<br />a summary of peak stages and discharges is presented in table 4. The
<br />~ydrograph of inflow to Conchas Reservoir is shown on plate 13.
<br />
<br />c. Canadian Rillel' wateI'8hed beLow Concha.e Dam. _ Roy reported
<br />3.02 inches from 6 p.m. on the 14th to 6 p.... on the 15th. The western
<br />portion of Harding County ~ad a total rainfall of more than five inches,
<br />and the southeastern part had less than one inch. The greatest 24-hour
<br />rainfall amount in this area was 4.15 inches at Grenville which occurred
<br />berween 8 a.... on the 17th and 8 a.m. on the 18th. Supplemental rain.
<br />fall reports indicated the following total storm amounts: Grenville
<br />13S,8inches;Grenville6SSE,7.5inches;andGrenvilleSSSW,6
<br />inches. Some portions of the area roccived less than two inches of
<br />total storm rainfall.
<br />
<br />EXTENT A.'./D U,\GNITlIOE OF FLOODING
<br />
<br />7. FLOOD CONDrTIORS IN THE ARKANSAS RIVER SUBBASIN ABOVE JOHN
<br />MARTIN RESERVDIR.- Rains on 14 June prOduced high flows in Fountain
<br />Creek just below Colorado Springs, the county seat of El Paso County;
<br />however, due to the small volume of flow, t~is peak diminished to about
<br />7,0.00. c.f.s. by the time it reached the Arkansas River. This flow com.
<br />bined with about 6,00.0 c.f.s. of snowmelt runoff in the Arkansas River
<br />atP...eblo, Colorado. Arkansas River tributaries below Fouotain Creek,
<br />including the Apishapa River w~ic~ .prod...ced an estimated peak of
<br />20,o.ODC.f.s., cooobined to create a peak of 31.0.0.0. c.f.s. at noon on
<br />17 June at La Junta, and about 20,000 c.f.s. at 6 a.m. on 18 June at
<br />Las Animas.
<br />
<br />6. GENERAL.- The storm of 13-19 June 1965 produced f1oodflo,,~ in
<br />the Arkansas River watershed from t~e headwaters of Fountain Creek in
<br />ColoradO to below Great Bend, Kansas, and in the Canadian River water-
<br />shed above Conchas Reservoir in New Me~ico. Comparisons of peak flows
<br />per square mile for both t~e Canadian and Arkansas Rivers and t~eir
<br />tributal'ies to the envelope curve ofnlaximum experienced peak di scharges
<br />in t~e Albuquerque District are shown on plate 9.
<br />
<br />8. Additional rains northeast of Colorado Springs on 17 June, as
<br />depicted by the iso~yctal map on plate 4. produced a peak of 47,0.0.0
<br />c.f.s. in the Fountain Creek at Pu"blo. This flood result"d frolll con-
<br />tributions by small tributary watersheds in El Paso County inc1udinR
<br />Sand Cr"ek and Jimmy Camp Creek with peak discharges of about 3.0.0.0.
<br />c.f.s. and124,000c.f.s., respectively.
<br />
<br />a. Colorndo.- Local flooding began in left bank tributaries
<br />of Fountain Creek on 14 June. General flooding throug~out t~e Arkansas
<br />River watershed below Pueblo resulted from the intensive precipitation
<br />during the night of 16-17 June. John Martin Reservoir contaIned the
<br />total volume of the flood from the area above the dam. The reservoir
<br />had stored 336,00.0. acre-feet by 3D Jlme. Caddoa Creek, a right bank
<br />tributary immediately DelOw tne dam, dlscnar~ed a flood of such magnitude
<br />that the Arkansas River was above flood stal!es throu;:ho...t the rea ches
<br />
<br />9. T~e flood of 17 June inundated most of the agricultural land
<br />in the Fountain Creek valley and caused severe damage to highway and
<br />railroad systems. The watersheds of Sand Creek, Jimmy Camp Creek, and
<br />Black Squirrel Creek were ravaged by the storm and flood. InEIPaso
<br />County many miles of county roads were washed out or damaged. The
<br />Chicago, Rock Island and Pacific Rallroad,whic~ runs northeast out of
<br />COloradO Sprlngs and across the Black Squirrel Creek watershed,was
<br />
<br />6
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<br />5
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