USGS Water-Year Summary for Site USGS 09010500

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00045 Precipitation(Sum)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Max.,Min.,Med.)

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Water year 2020: 2019-10-01 to 2020-09-30

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USGS Water-Year Summary 2020

09010500 COLORADO RIVER BELOW BAKER GULCH NEAR GRAND LAKE, CO

LOCATION - Lat 40°19'33", long 105°51'22" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 sec.12, T.4 N., R.76 W., Grand County, CO, Hydrologic Unit 14010001, on left bank 500 ft downstream from Baker Gulch, which includes Bowen Gulch drainage basin, and 5.5 mi northwest of town of Grand Lake.

DRAINAGE AREA - 63.8 mi².

REVISIONS HISTORY - WDR-US-2011: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - May 1953 to current year.

GAGE - Water-stage recorder with satellite telemetry and crest-stage gage. Elevation of gage is 8,750 ft above NGVD of 1929, from topographic map.

REMARKS - Water year 2014; records good except for estimated daily discharges, which are poor. Water year 2015; records good except for estimated daily discharges, which are poor. Water year 2016; records good except for estimated daily discharges, which are poor. Water year 2017; records good except for estimated daily discharges, which are poor. Water year 2018; records good except for estimated daily discharges, which are poor. Water year 2019; records good except for estimated daily discharges, which are poor. Water year 2020; records good except for estimated daily discharges, which are poor. Water year 2021; records good except for estimated daily discharges, which are poor. Water year 2022; records good except for estimated daily discharges, which are poor. Water year 2023; records good except for estimated daily discharges, which are poor. Transmountain diversion upstream from station by Grand River Ditch. Prior to water year 2006, the gage location was described as being 1.0 mi upstream from Bowen Gulch. However, field inspection during Aug. 2006 found that Bowen Gulch is now a tributary to Baker Gulch.

DISCHARGE, CUBIC FEET PER SECOND
YEAR 2019-10-01 to 2020-09-30
DAILY MEAN VALUES
[e, Value has been estimated.]

Day	Oct
	2019
1	19.1
2	18.5
3	18.3
4	18.2
5	17.6
6	17.8
7	e16.8
8	e17.0
9	e17.0
10	e17.0
11	e17.0
12	e17.1
13	e17.2
14	e17.3
15	e17.4
16	e17.5
17	e17.7
18	e17.8
19	e17.9
20	e18.1
21	e18.3
22	e18.6
23	e18.8
24	e19.0
25	e19.0
26	e19.0
27	e19.1
28	e19.1
29	e19.1
30	e19.1
31	e19.1
Total	561
Mean	18.1
Max	19.1
Min	16.8
Ac-ft	1,112

Day	Nov
2019
1	e19.0
2	e18.9
3	e18.7
4	e18.6
5	e18.5
6	e18.3
7	e18.0
8	e17.8
9	e17.5
10	e17.1
11	e16.7
12	e16.5
13	e16.4
14	e16.4
15	e16.4
16	e16.3
17	e16.3
18	e16.4
19	e16.5
20	e16.5
21	e16.5
22	e16.3
23	e16.2
24	e16.0
25	e15.9
26	e15.7
27	e15.6
28	e15.6
29	e15.5
30	e15.6
--
Total	506
Mean	16.9
Max	19.0
Min	15.5
Ac-ft	1,003

Day	Dec
2019
1	e15.7
2	e15.9
3	e16.0
4	e16.2
5	e16.4
6	e16.5
7	e16.7
8	e16.8
9	e16.9
10	e17.0
11	e17.1
12	e17.2
13	e17.3
14	e17.4
15	e17.4
16	e17.5
17	e17.5
18	e17.5
19	e17.5
20	e17.5
21	e17.5
22	e17.3
23	e17.3
24	e17.2
25	e17.1
26	e17.0
27	e16.9
28	e16.8
29	e16.5
30	e16.1
31	e15.6
Total	523
Mean	16.9
Max	17.5
Min	15.6
Ac-ft	1,038

Day	Jan
2020
1	e15.2
2	e14.7
3	e14.2
4	e13.7
5	e13.3
6	e12.9
7	e12.7
8	e12.3
9	e11.7
10	e11.1
11	e10.6
12	e10.1
13	e9.49
14	e8.87
15	e8.38
16	e7.99
17	e7.53
18	e6.86
19	e6.28
20	e5.89
21	e5.59
22	e5.38
23	e5.22
24	e5.10
25	e5.00
26	e4.92
27	e4.82
28	e4.81
29	e4.94
30	e5.12
31	e5.32
Total	270
Mean	8.71
Max	15.2
Min	4.81
Ac-ft	536

Day	Feb
2020
1	e5.57
2	e5.79
3	e6.12
4	e6.45
5	e6.67
6	e6.92
7	e7.17
8	e7.36
9	e7.56
10	e7.78
11	e7.97
12	e8.15
13	e8.34
14	e8.44
15	e8.51
16	e8.52
17	e8.57
18	e8.61
19	e8.50
20	e8.48
21	e8.51
22	e8.49
23	e8.43
24	e8.40
25	e8.22
26	e8.01
27	e7.94
28	e7.90
29	e7.82
--
--
Total	225
Mean	7.77
Max	8.61
Min	5.57
Ac-ft	447

Day	Mar
2020
1	e7.73
2	e7.66
3	e7.57
4	e7.46
5	e7.37
6	e7.28
7	e7.21
8	e7.15
9	e7.08
10	e6.84
11	e6.60
12	e6.37
13	e6.15
14	e5.94
15	e5.70
16	e5.49
17	e5.44
18	e5.49
19	e5.53
20	e5.58
21	e5.65
22	e5.75
23	e5.88
24	e6.04
25	e6.22
26	e6.41
27	e6.64
28	e6.87
29	e7.10
30	e7.46
31	e7.96
Total	204
Mean	6.57
Max	7.96
Min	5.44
Ac-ft	404

Day	Apr
2020
1	e8.99
2	e9.61
3	e9.91
4	e10.2
5	e10.5
6	e10.9
7	e12.0
8	e13.3
9	e14.4
10	e15.9
11	e17.9
12	e22.2
13	e20.4
14	e18.2
15	e17.5
16	17.6
17	e16.4
18	e14.6
19	16.2
20	e16.3
21	e17.4
22	e18.2
23	e19.5
24	e20.3
25	20.5
26	e22.9
27	31.1
28	54.3
29	77.6
30	106
--
Total	681
Mean	22.7
Max	106
Min	8.99
Ac-ft	1,350

Day	May
2020
1	150
2	192
3	229
4	221
5	181
6	161
7	166
8	161
9	164
10	164
11	175
12	193
13	197
14	186
15	176
16	192
17	204
18	254
19	300
20	339
21	321
22	273
23	258
24	243
25	206
26	184
27	197
28	237
29	292
30	360
31	447
Total	7,023
Mean	227
Max	447
Min	150
Ac-ft	13,930

Day	Jun
2020
1	515
2	530
3	526
4	500
5	489
6	510
7	484
8	426
9	362
10	290
11	225
12	206
13	214
14	236
15	218
16	197
17	192
18	185
19	181
20	156
21	147
22	141
23	137
24	132
25	129
26	123
27	119
28	110
29	103
30	99.0
--
Total	7,882
Mean	263
Max	530
Min	99.0
Ac-ft	15,630

Day	Jul
2020
1	88.7
2	81.6
3	77.6
4	77.4
5	76.2
6	71.1
7	66.7
8	62.6
9	58.8
10	54.7
11	51.3
12	49.2
13	48.8
14	48.1
15	47.0
16	42.8
17	40.9
18	39.2
19	37.3
20	35.4
21	32.7
22	31.7
23	31.7
24	30.6
25	30.4
26	35.5
27	30.9
28	32.4
29	31.2
30	27.6
31	25.9
Total	1,496
Mean	48.3
Max	88.7
Min	25.9
Ac-ft	2,967

Day	Aug
2020
1	24.8
2	24.3
3	23.4
4	22.5
5	22.4
6	22.2
7	20.8
8	19.7
9	19.1
10	18.7
11	18.5
12	17.9
13	17.5
14	16.8
15	16.3
16	16.2
17	15.9
18	15.7
19	15.6
20	25.0
21	25.1
22	24.5
23	24.1
24	24.0
25	24.7
26	24.7
27	27.5
28	26.7
29	27.1
30	30.6
31	25.3
Total	678
Mean	21.9
Max	30.6
Min	15.6
Ac-ft	1,344

Day	Sep
2020
1	26.8
2	23.7
3	22.3
4	21.1
5	20.2
6	19.5
7	19.3
8	21.0
9	23.7
10	25.7
11	29.3
12	28.7
13	28.8
14	25.8
15	23.6
16	22.1
17	21.2
18	20.4
19	20.1
20	19.5
21	18.9
22	18.4
23	18.3
24	17.5
25	16.9
26	16.1
27	15.6
28	15.6
29	15.6
30	15.4
--
Total	631
Mean	21.0
Max	29.3
Min	15.4
Ac-ft	1,252

STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1953 - 2020, BY WATER YEAR (WY)
	Oct	Nov	Dec	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep
Mean	24.3	16.0	10.9	8.72	7.65	8.81	30.8	174	324	118	33.6	25.7
Max	83.7	37.2	28.5	24.1	17.3	29.6	76.6	329	815	942	104	78.1
(WY)	(1962)	(1962)	(2015)	(2015)	(2015)	(2015)	(2017)	(1996)	(2011)	(2011)	(1983)	(1997)
Min	9.25	6.14	4.33	3.50	3.67	3.90	9.11	65.7	67.0	24.3	11.1	10.0
(WY)	(1957)	(2003)	(2003)	(2003)	(2003)	(2003)	(1991)	(1995)	(2012)	(2002)	(1954)	(2018)

SUMMARY STATISTICS
	Water Year 2020		Water Years 1953 - 2020
Annual total	20,680
Annual mean	56.5		65.5
Highest annual mean			178.7	2011
Lowest annual mean			26.3	1954
Highest daily mean	530.0	Jun 02	1,770	Jul 09, 2011
Lowest daily mean	4.81	Jan 28	3.00	Jan 13, 1963
Annual 7-day minimum	4.96	Jan 24	3.20	Jan 18, 2003
Maximum peak flow	575^a	Jun 02	1,870	Jul 09, 2011
Maximum peak stage	7.59	Jun 02	7.81	Jul 01, 2019
Annual runoff (cfsm)	0.886		1.03
Annual runoff (inches)	12.1		14.0
10 percent exceeds	192.0		190.0
50 percent exceeds	17.5		18.0
90 percent exceeds	6.85		6.99

^a Discharge affected by Regulation or Diversion

USGS Water-data graph for site USGS 09010500