USGS Water-Year Summary for Site 07152000

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	00060 Discharge(Mean)

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Water year 2019: 2018-10-01 to 2019-09-30

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USGS Water-Year Summary 2019

07152000 CHIKASKIA RIVER NEAR BLACKWELL, OK

LOCATION - Lat 36°48'41", long 97°16'37" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.23, T.27 N., R.1 W., Kay County, OK, Hydrologic Unit 11060005, near left bank on downstream side of State Highway 11 bridge at northeast edge of Blackwell, 0.1 mi downstream from Bitter Creek, and at mile 28.3.

DRAINAGE AREA - 1,876 mi² of which 3 mi² probably is noncontributing. from automated delineation using 10-meter National Elevation Dataset digital elevation model data dated 10/01/2006 and Watershed Boundary Dataset dated 10/01/2006, using Albers Equal-Area Projection, North American Datum 1983.

REVISIONS HISTORY - WSP 1117: Drainage area, WDR 2012: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD -

October 1935 to current year. Monthly discharge only for some periods, published in WSP 1311. Gage was inactive 04/02/2020-09/30/2020 as a result of bridge reconstruction.

GAGE - Water-stage recorder. Datum of gage is 967.65 feet above NAVD of 1988. The NAVD of 1988 datum was determined by a Level II GNSS survey (Reference Frame NAD_83(2011) (EPOCH:2010.0000) ITRF2014 (EPOCH:2022.6074) (GEOID18) by USGS personnel on 8/10/2022 and tied to RM-2. Prior to 8/10/2022 the datum of gage was 967.41 ft above NGVD of 1929. See WSP 1921 for history of changes prior to April, 1952

REMARKS -

10/01/2023 - 09/30/2024: records poor. Quality of data for other periods can be obtained by contacting the Oklahoma-Texas Water Science Center. Some regulation at low flow by Lake Blackwell, capacity 3,600 acre-ft, 12.6 mi upstream from station. Small diversion made from reservoir for municipal supply.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood of June 10, 1923, reached a stage of about 34 ft, present site and datum, from information provided by local residents, discharge 100,000 ft³/s.

DISCHARGE, CUBIC FEET PER SECOND
YEAR 2018-10-01 to 2019-09-30
DAILY MEAN VALUES
[e, Value has been estimated.]

Day	Oct
	2018
1	111
2	106
3	e99.1
4	165
5	163
6	140
7	168
8	5,520
9	22,000
10	36,700
11	28,900
12	7,370
13	2,850
14	1,990
15	1,610
16	1,400
17	1,190
18	1,010
19	875
20	778
21	704
22	e642
23	589
24	554
25	557
26	606
27	676
28	589
29	e516
30	472
31	444
Total	119,500
Mean	3,855
Max	36700
Min	99.1
Ac-ft	237,000

Day	Nov
2018
1	427
2	409
3	e395
4	379
5	e369
6	359
7	351
8	347
9	343
10	e338
11	336
12	331
13	332
14	330
15	324
16	322
17	322
18	321
19	317
20	308
21	e303
22	e298
23	e299
24	292
25	286
26	287
27	286
28	285
29	285
30	288
--
Total	9,869
Mean	329
Max	427
Min	285
Ac-ft	19,580

Day	Dec
2018
1	e304
2	305
3	307
4	299
5	277
6	271
7	269
8	266
9	262
10	260
11	e259
12	260
13	260
14	254
15	254
16	253
17	246
18	244
19	245
20	e246
21	242
22	242
23	239
24	e237
25	237
26	300
27	3,440
28	7,950
29	2,820
30	1,450
31	1,070
Total	23,570
Mean	760
Max	7950
Min	237
Ac-ft	46,750

Day	Jan
2019
1	881
2	764
3	680
4	680
5	668
6	593
7	557
8	527
9	492
10	458
11	487
12	2,350
13	3,000
14	1,370
15	817
16	651
17	589
18	551
19	532
20	789
21	766
22	610
23	564
24	528
25	473
26	455
27	438
28	429
29	424
30	415
31	374
Total	22,910
Mean	739
Max	3000
Min	374
Ac-ft	45,450

Day	Feb
2019
1	384
2	388
3	366
4	394
5	394
6	e383
7	e313
8	e264
9	e254
10	e321
11	384
12	362
13	e364
14	e362
15	348
16	339
17	332
18	324
19	316
20	326
21	307
22	354
23	382
24	436
25	616
26	557
27	455
28	396
--
--
--
Total	10,420
Mean	372
Max	616
Min	254
Ac-ft	20,670

Day	Mar
2019
1	373
2	365
3	e320
4	e260
5	e230
6	e252
7	e353
8	359
9	e361
10	352
11	352
12	443
13	3,900
14	6,000
15	2,560
16	1,200
17	833
18	690
19	607
20	553
21	515
22	486
23	500
24	550
25	685
26	597
27	496
28	e446
29	440
30	432
31	420
Total	25,929
Mean	836
Max	6000
Min	230
Ac-ft	51,430

Day	Apr
2019
1	391
2	373
3	e364
4	372
5	361
6	361
7	408
8	546
9	410
10	345
11	334
12	317
13	306
14	293
15	277
16	270
17	276
18	2,290
19	3,150
20	1,100
21	595
22	449
23	412
24	529
25	465
26	373
27	332
28	e301
29	e292
30	1,730
--
Total	18,020
Mean	601
Max	3150
Min	270
Ac-ft	35,750

Day	May
2019
1	9,020
2	3,810
3	1,700
4	3,090
5	1,630
6	976
7	2,120
8	25,800
9	49,200
10	22,400
11	5,130
12	3,290
13	2,590
14	2,120
15	1,790
16	1,520
17	1,300
18	1,290
19	1,550
20	3,780
21	39,500
22	43,200
23	19,000
24	5,870
25	16,000
26	21,800
27	25,400
28	29,700
29	10,600
30	4,130
31	3,210
Total	362,500
Mean	11,690
Max	49200
Min	976
Ac-ft	719,000

Day	Jun
2019
1	2,670
2	2,350
3	2,130
4	2,260
5	3,090
6	4,100
7	8,160
8	3,270
9	2,210
10	2,700
11	2,070
12	1,640
13	1,350
14	1,170
15	3,410
16	3,660
17	3,650
18	2,360
19	3,250
20	7,000
21	2,490
22	1,540
23	3,710
24	15,300
25	5,480
26	2,310
27	1,730
28	1,410
29	1,200
30	1,040
--
Total	98,710
Mean	3,290
Max	15300
Min	1040
Ac-ft	195,800

Day	Jul
2019
1	923
2	835
3	2,880
4	1,810
5	986
6	804
7	1,230
8	930
9	728
10	645
11	572
12	520
13	485
14	447
15	417
16	429
17	663
18	500
19	357
20	319
21	299
22	282
23	270
24	262
25	249
26	242
27	228
28	214
29	218
30	207
31	193
Total	19,140
Mean	618
Max	2880
Min	193
Ac-ft	37,970

Day	Aug
2019
1	184
2	184
3	232
4	227
5	251
6	217
7	189
8	207
9	211
10	215
11	207
12	234
13	252
14	193
15	211
16	299
17	252
18	210
19	185
20	167
21	155
22	204
23	459
24	262
25	418
26	2,920
27	2,480
28	1,100
29	616
30	897
31	1,820
Total	15,659
Mean	505
Max	2920
Min	155
Ac-ft	31,060

Day	Sep
2019
1	709
2	436
3	350
4	305
5	267
6	239
7	224
8	209
9	187
10	182
11	169
12	198
13	1,380
14	640
15	265
16	205
17	179
18	165
19	156
20	147
21	142
22	1,340
23	2,750
24	619
25	540
26	7,520
27	7,980
28	1,830
29	1,200
30	831
--
Total	31,360
Mean	1,045
Max	7980
Min	142
Ac-ft	62,210

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1936 - 2019, BY WATER YEAR (WY)
	Oct	Nov	Dec	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep
Mean	584	471	289	272	384	729	818	1,245	1,159	589	374	498
Max	5,244	5,880	1,649	1,659	3,731	5,342	4,748	11,690	6,894	5,129	2,467	4,616
(WY)	(1960)	(1999)	(1945)	(1949)	(1949)	(2000)	(1944)	(2019)	(2007)	(1951)	(1995)	(2008)
Min	.90	1.08	1.34	4.35	10.3	30.7	29.4	27.1	26.1	5.13	.55	.64
(WY)	(1957)	(1955)	(1955)	(1957)	(1957)	(1957)	(1955)	(1956)	(1972)	(2012)	(1936)	(1956)

SUMMARY STATISTICS
	Water Year 2019		Water Years 1936 - 2019
Annual total	757,600
Annual mean	2,076		621.8
Highest annual mean			2,076	2019
Lowest annual mean			71.0	1954
Highest daily mean	49,200	May 09	69,500	Jun 22, 1942
Lowest daily mean	99.1	Oct 03	0.0	Jul 18, 1954
Annual 7-day minimum	136.0	Oct 01	0.0	Aug 12, 1954
Maximum peak flow	51,600^a	May 09	85,000	Jun 22, 1942
Maximum peak stage	34.46	May 09	35.36	Sep 14, 2008
Annual runoff (cfsm)	1.11		0.330
Annual runoff (inches)	15.0		4.48
10 percent exceeds	3,422		963.0
50 percent exceeds	436.0		155.0
90 percent exceeds	217.6		27.0

^a Discharge affected to unknown degree by Regulation or Diversion

USGS Water-data graph for site USGS 07152000