10336660 BLACKWOOD CREEK NEAR TAHOE CITY, CA
LOCATION.-Lat 39°06'27", long 120°09'40", in NW 1/4 NE 1/4 sec.36, T.15 N., R.16 E., Placer County, Hydrologic Unit 16050101, on right
bank 300 ft upstream from bridge on State Highway 89, 1,000 ft upstream from Lake Tahoe, and 4.6 mi south of Tahoe City.
DRAINAGE AREA.-11.2 mi2.
WATER-DISCHARGE RECORDS
PERIOD OF RECORD.-October 1960 to current year.
GAGE.-Water-stage recorder and crest-stage gage. Datum of gage is 6,234.59 ft above sea level. Oct. 1, 1960, to Sept. 30, 1964, at datum 10.25 ft
lower and Oct. 1, 1964, to Aug. 27, 1970, at datum 12 ft lower, at site 400 ft downstream.
REMARKS.-Records good except for daily discharges after Jan. 1, which are poor. No known diversion or regulation upstream from station. See
schematic diagram of Truckee River Basin.
EXTREMES FOR PERIOD OF RECORD.-Maximum discharge, 2,940 ft3/s, Jan. 1, 1997, gage height, 9.82 ft; maximum gage height, 9.90 ft,
site and datum then in use, Dec. 22, 1964; minimum daily, 0.50 ft3/s, Sept. 24, 1968.
EXTREMES FOR CURRENT YEAR.-Peak discharges greater than base discharge of 200 ft3/s, or maximum:
Discharge Gage height Discharge Gage height
Date Time (ft3/s) (ft) Date Time (ft3/s) (ft)
Nov. 18 0515 323 2.80 Jan. 1 1415 2,940 9.82
Dec. 5 0945 249 2.51 Apr. 19 0700 268 2.76
Dec. 12 0515 403 3.07
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 2.3 2.7 20 2000 35 e20 63 130 113 25 4.8 2.6
2 2.3 2.5 16 1970 35 e20 54 131 103 20 4.5 2.7
3 2.1 2.4 14 471 34 e20 47 132 98 18 4.4 2.8
4 2.1 2.2 15 234 32 e20 45 134 158 17 4.8 2.6
5 2.1 2.2 139 160 30 e19 44 137 127 17 4.9 2.6
6 2.1 2.2 62 e135 30 e19 44 137 103 15 4.9 2.5
7 2.2 2.2 42 94 e29 e19 51 137 100 14 4.4 2.5
8 2.1 2.2 43 84 27 e20 53 136 95 13 4.5 2.5
9 1.8 2.2 49 81 26 e20 51 140 94 13 4.8 2.2
10 1.7 2.2 54 76 25 e21 46 142 85 12 4.7 2.2
11 1.8 2.2 73 71 24 e23 46 143 79 10 4.7 2.0
12 2.0 2.2 e276 71 23 e25 49 148 76 10 4.5 1.9
13 1.9 2.2 140 55 23 e24 52 170 76 9.1 4.4 1.8
14 2.0 2.2 87 50 23 e24 57 170 84 9.7 4.3 1.7
15 1.9 2.2 64 48 22 e27 66 165 82 8.9 4.1 1.9
16 2.1 2.4 53 44 22 e30 76 162 78 8.7 3.9 1.7
17 2.1 71 47 42 23 e35 90 161 74 8.5 3.8 1.7
18 2.4 171 41 44 22 e37 106 158 69 9.1 3.7 1.8
19 2.7 64 38 39 22 e45 216 156 64 8.4 3.6 1.8
20 2.6 60 35 37 22 59 170 147 59 8.2 3.3 1.5
21 2.6 47 e35 35 22 61 217 131 54 7.8 3.3 1.4
22 2.5 86 e35 e37 21 68 170 116 49 8.3 3.1 1.3
23 2.2 45 e35 e40 21 82 205 124 43 8.1 3.0 1.2
24 2.7 34 e35 e44 22 86 139 120 40 8.3 3.0 1.1
25 3.2 28 e36 e44 e22 86 150 104 37 7.9 3.0 1.1
26 3.1 24 e36 e44 e22 105 150 97 33 7.6 2.8 1.1
27 3.0 20 e36 44 e22 102 143 98 31 7.3 2.8 1.2
28 2.8 19 36 40 e21 95 130 107 31 7.0 2.7 1.0
29 3.0 16 66 39 --- 85 135 114 29 6.8 2.7 1.1
30 3.1 14 178 37 --- 79 126 123 28 6.6 2.6 1.2
31 2.8 --- 421 36 --- 73 --- 123 --- 6.1 2.6 ---
TOTAL 73.3 735.4 2257 6246 702 1449 2991 4193 2192 336.4 118.6 54.7
MEAN 2.36 24.5 72.8 201 25.1 46.7 99.7 135 73.1 10.9 3.83 1.82
MAX 3.2 171 421 2000 35 105 217 170 158 25 4.9 2.8
MIN 1.7 2.2 14 35 21 19 44 97 28 6.1 2.6 1.0
AC-FT 145 1460 4480 12390 1390 2870 5930 8320 4350 667 235 108
e Estimated.
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1961 - 1997, BY WATER YEAR (WY)
OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
MEAN 5.04 13.4 21.2 26.7 22.3 30.9 61.2 129 99.6 28.3 5.79 2.88
MAX 28.1 94.8 157 201 116 122 124 312 320 149 36.1 10.3
(WY) 1963 1984 1965 1997 1986 1986 1989 1969 1983 1983 1983 1982
MIN 1.31 1.68 1.90 2.00 2.27 3.82 13.6 29.7 7.20 3.11 1.51 1.21
(WY) 1978 1978 1977 1991 1991 1977 1975 1977 1992 1987 1994 1992
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1961 - 1997
ANNUAL TOTAL 20272.0 21348.4
ANNUAL MEAN 55.4 58.5 37.2
HIGHEST ANNUAL MEAN 73.4 1982
LOWEST ANNUAL MEAN 8.71 1977
HIGHEST DAILY MEAN 607 May 16 2000 Jan 1 2000 Jan 1 1997
LOWEST DAILY MEAN 1.7 Oct 10 1.0 Sep 28 .50 Sep 24 1968
ANNUAL SEVEN-DAY MINIMUM 1.8 Aug 30 1.1 Sep 23 .54 Sep 23 1968
INSTANTANEOUS PEAK FLOW 2940 Jan 1 2940 Jan 1 1997
INSTANTANEOUS PEAK STAGE 9.82 Jan 1 9.90 Dec 22 1964
ANNUAL RUNOFF (AC-FT) 40210 42340 26970
10 PERCENT EXCEEDS 150 136 107
50 PERCENT EXCEEDS 32 27 10
90 PERCENT EXCEEDS 2.1 2.2 2.1
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1997 California Hydrologic Data
Report
10336660 BLACKWOOD CREEK NEAR TAHOE CITY, CA-Continued
WATER-QUALITY RECORDS
PERIOD OF RECORD.-Water years 1975-78, 1980 to current year.
PERIOD OF DAILY RECORD.-
SPECIFIC CONDUCTANCE: December 1980 to September 1983.
WATER TEMPERATURE: October 1974 to June 1978 (1977-78 storm season only), October 1979 to September 1992.
SUSPENDED-SEDIMENT DISCHARGE: October 1974 to June 1978 (1977-78 storm season only), October 1979 to September 1992.
REMARKS.-In October 1992, station was incorporated into the expanded Lake Tahoe Interagency Monitoring Program to monitor tributary
contributions of nutrients and sediment to Lake Tahoe. These data are reviewed and provided by the Nevada District Office, U.S. Geological
Survey.
WATER-QUALITY DATA, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997
DIS- OXYGEN, NITRO-
CHARGE, SPE- DIS- GEN,
INST. CIFIC SOLVED NO2+NO3
CUBIC CON- TEMPER- TEMPER- OXYGEN, (PER- DIS-
FEET DUCT- ATURE ATURE DIS- CENT SOLVED
DATE TIME PER ANCE AIR WATER SOLVED SATUR- (MG/L
SECOND (US/CM) (DEG C) (DEG C) (MG/L) ATION) AS N)
(00061) (00095) (00020) (00010) (00300) (00301) (00631)
OCT
17... 1505 2.2 79 11.0 8.0 9.2 97 0.003
NOV
17... 1030 11 69 6.0 3.5 10.0 95 0.008
17... 1750 125 35 4.0 2.5 -- -- 0.046
17... 2325 206 30 6.5 2.5 -- -- 0.047
18... 1145 154 30 6.0 4.0 10.2 98 0.063
19... 2020 133 32 3.5 2.5 -- -- 0.032
20... 1115 55 38 7.5 4.5 -- -- 0.044
21... 2250 122 33 3.5 4.0 -- -- 0.015
22... 1615 75 38 0.0 2.0 -- -- 0.019
DEC
05... 0935 247 30 2.0 1.0 -- -- 0.015
05... 1645 130 36 0.0 1.0 -- -- 0.019
11... 2045 122 40 1.5 1.0 -- -- 0.012
12... 0650 48 29 2.0 1.0 -- -- 0.011
12... 1630 67 33 2.5 1.5 -- -- 0.014
29... 2200 151 38 2.0 0.0 -- -- 0.006
30... 1155 155 40 3.0 1.0 -- -- 0.003
30... 2205 242 40 2.0 0.5 -- -- 0.030
31... 1010 334 36 4.5 1.0 -- -- 0.003
JAN
01... 0700 1310 27 -- -- -- -- 0.012
01... 1115 2510 22 -- -- -- -- 0.007
01... 1615 2720 21 -- -- -- -- 0.007
02... 1105 2330 21 -- 1.0 -- -- 0.004
02... 2155 914 27 1.0 1.5 -- -- 0.005
03... 1755 323 33 -1.5 1.5 -- -- 0.003
06... 1015 135 41 -4.0 0.5 -- -- 0.022
10... 1300 71 45 2.5 3.0 -- -- 0.023
FEB
13... 1505 23 56 4.5 4.0 10.2 97 0.004
MAR
15... 1540 27 55 8.0 6.5 -- -- 0.005
26... 1255 110 44 11.5 7.0 -- -- 0.011
APR
14... 1435 53 50 9.0 8.5 -- -- 0.006
19... 1120 237 31 9.0 3.5 -- -- 0.026
19... 1815 209 33 7.0 3.0 -- -- 0.052
21... 1635 230 33 9.0 4.0 10.3 99 0.020
22... 1410 157 36 12.0 6.0 9.7 98 0.016
30... 1550 130 39 7.0 5.0 9.9 98 0.009
MAY
08... 0645 128 34 0.5 2.5 -- -- 0.008
14... 1950 193 29 12.5 5.5 9.9 98 0.007
22... 1630 110 34 14.0 9.0 8.9 97 0.006
23... 1810 148 31 5.5 5.0 -- -- 0.002
JUN
02... 1950 103 31 12.5 8.5 -- -- 0.005
04... 0735 77 30 6.0 5.0 -- -- 0.009
04... 1735 103 28 7.0 6.0 9.6 99 0.010
08... 2105 102 33 10.0 7.0 -- -- 0.008
18... 1520 65 37 -- 15.5 7.8 99 0.003
JUL
17... 1440 8.4 56 19.5 18.5 7.0 93 0.006
AUG
18... 1530 3.7 69 21.0 19.5 6.9 95 0.009
SEP
16... 1525 1.9 73 16.5 14.0 8.0 98 0.004
10336660 BLACKWOOD CREEK NEAR TAHOE CITY, CA-Continued
WATER-QUALITY DATA, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997
NITRO- NITRO- PHOS- IRON, SEDI-
GEN, GEN,AM- PHORUS BIO. MENT,
AMMONIA MONIA + PHOS- ORTHO, REACT- SEDI- DIS-
DIS- ORGANIC PHORUS DIS- IVE MENT, CHARGE,
SOLVED TOTAL TOTAL SOLVED TOTAL SUS- SUS-
DATE (MG/L (MG/L (MG/L (MG/L (UG/L PENDED PENDED
AS N) AS N) AS P) AS P) AS FE) (MG/L) (T/DAY)
(00608) (00625) (00665) (00671) (46568) (80154) (80155)
OCT
17... 0.004 0.27 0.020 0.005 210 <1 <0.01
NOV
17... 0.002 0.16 0.048 0.010 387 9 0.27
17... 0.003 0.30 0.288 0.009 2220 133 45
17... 0.004 0.16 0.533 0.011 1820 383 213
18... 0.003 0.20 0.125 0.007 1760 114 47
19... 0.002 0.17 0.112 0.007 1630 132 47
20... 0.002 0.15 0.021 0.006 73 7 1.0
21... <0.001 0.12 0.089 0.004 1420 126 42
22... <0.001 0.16 0.019 0.003 1880 7 1.4
DEC
05... 0.003 0.13 0.304 0.008 1270 402 268
05... 0.001 0.18 0.059 0.006 374 56 20
11... 0.002 0.22 0.079 0.006 446 108 36
12... 0.001 0.25 0.322 0.008 1410 530 69
12... 0.001 0.27 0.069 0.006 866 96 17
29... <0.001 0.30 0.089 0.002 411 128 52
30... <0.001 0.32 0.066 0.002 479 71 30
30... 0.010 0.34 0.109 0.011 522 218 142
31... <0.001 0.36 0.084 0.002 559 146 132
JAN
01... <0.001 0.68 1.01 0.007 691 1700 6010
01... <0.001 0.10 1.88 0.005 472 2840 19200
01... 0.001 0.80 1.31 0.004 762 1220 8960
02... 0.001 1.3 1.47 0.005 1030 2370 14900
02... <0.001 0.84 0.509 0.005 3910 662 1630
03... <0.001 0.32 0.196 0.004 373 352 307
06... 0.002 0.29 0.046 0.003 306 72 26
10... 0.003 0.30 0.022 0.003 315 11 2.1
FEB
13... 0.001 0.19 0.011 0.004 142 2 0.12
MAR
15... 0.002 0.15 0.022 0.005 280 7 0.51
26... 0.002 -- 0.018 0.005 252 20 5.9
APR
14... 0.002 0.32 0.013 0.004 145 8 1.1
19... <0.001 0.34 0.374 0.006 6620 572 366
19... <0.001 0.27 0.197 0.006 4000 300 169
21... 0.001 0.25 0.160 0.005 3830 293 182
22... 0.002 0.28 0.070 0.005 1190 86 36
30... 0.001 0.05 0.022 0.003 249 20 7.0
MAY
08... 0.001 0.17 0.022 0.004 289 21 7.3
14... 0.010 0.06 0.057 0.003 1100 93 48
22... 0.005 0.06 0.020 0.003 273 16 4.8
23... 0.001 0.11 0.026 0.003 484 38 15
JUN
02... <0.001 0.04 0.026 0.003 184 10 2.8
04... <0.001 0.09 0.037 0.002 340 32 6.7
04... <0.001 0.18 0.105 0.003 1280 123 34
08... 0.001 0.09 0.061 0.014 557 39 11
18... 0.001 0.06 0.016 0.004 138 2 0.35
JUL
17... 0.002 0.05 0.024 0.010 148 2 0.04
AUG
18... 0.002 0.16 0.035 0.012 167 <1 <0.01
SEP
16... 0.006 0.04 0.051 0.010 154 1 0.01
USGS Water Resources of California
USGS Headquarters | Biology
| Geology |
Mapping | Water
Contact:
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Last modified: Wed Mar 10 14:06:54 PST 1999