Site ID: 537 Lat. 65.8664 USA Alaska
River: Koyukuk Long. -156.2669
Site name: Old Cutoff Trading Post Contributing area: 58136 km2 Ratio to Comparison Station: 2.06
Latest measurement: 17-Jul-10 Mean annual runoff: 152 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 61.3 mm
Latest M/C ratio: 1.23 Seven day total: 5.5 mm
Estimated current discharge: 476 m3/sec Percent of mean 7-day total: 91.1 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 2272 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 2490 m3/sec (from Gumbel Extreme Value analysis)
Comparison Station Information:  Boluo (2186950)           Contributing Area:   sq mi 28239 sq km
(Data from this gaging station are used for the calibration to discharge, with an adjustment for different contributing areas)
Notes: Final calibration to discharge has not yet been accomplished.
Discharge and runoff, based on satellite remote sensing (NASA AMSR-E data)
(For U.S, sites, nearby ground station discharge may also be shown)
Annual  Monthly Total Runoff (mm), computed from above satellite-based discharge data
Runoff
(mm) Jan Feb Mar April May June July Aug Sept Oct Nov Dec
41 2002 no data no data no data no data no data no data no data 15.2 16.0 9.9 0.1 0.3
149 2003 0.1 3.3 0.0 1.4 19.6 39.1 27.1 21.4 24.0 11.4 1.3 0.2
125 2004 0.2 0.1 0.1 0.1 34.0 37.1 22.0 18.6 12.3 0.2 0.1 0.2
262 2005 0.2 0.1 0.2 0.8 78.1 76.7 38.1 28.2 24.6 15.1 0.1 0.2
108 2006 0.1 0.1 0.0 1.0 26.8 46.3 32.3 1.0 0.0 0.0 0.0 0.0
120 2007 0.2 0.1 0.0 2.6 19.5 26.3 24.1 25.3 18.9 2.8 0.1 0.1
112 2008 0.1 0.1 0.1 0.1 24.8 31.0 25.3 16.8 11.8 1.1 0.1 0.2
189 2009 0.1 0.1 0.2 0.2 52.9 61.1 31.2 20.4 15.0 7.6 0.1 0.2
61 2010 0.2 0.1 0.0 0.1 21.0 25.5 14.3 0.0 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 152 Standard Deviation: 6.4
Trend in Annual Runoff (slope):  -73
Discharge is estimated via a rating equation directly from the remote sensing data (M/C ratio) shown below.
Green line records upwelling microwave emission from within 5 km radius of a calbration land target. 
Explanation:   Blue line is emission from within 5 km radius of the measurement target centered over the river.
Brown line is their ratio (M/C; "HR" in Brakenridge et al 2007; scale on right) and is used to estimate river discharge via a rating equation.
Rating equations are being developed and applied on an individual basis using available ground-based discharge information.
GoogleEarth View of Measurement Site
Return
Estimated
Disharge
Data
Date m3/sec
22-Jul-02 561
23-Jul-02 561
24-Jul-02 558
25-Jul-02 599
26-Jul-02 578
27-Jul-02 508
28-Jul-02 470
29-Jul-02 371
30-Jul-02 387
31-Jul-02 404
1-Aug-02 435
2-Aug-02 528
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 450
10-Aug-02 503
11-Aug-02 543
12-Aug-02 482
13-Aug-02 464
14-Aug-02 408
15-Aug-02 301
16-Aug-02 347
17-Aug-02 298
18-Aug-02 342
19-Aug-02 348
20-Aug-02 320
21-Aug-02 364
22-Aug-02 317
23-Aug-02 399
24-Aug-02 389
25-Aug-02 404
26-Aug-02 476
27-Aug-02 431
28-Aug-02 453
29-Aug-02 452
30-Aug-02 363
31-Aug-02 423
1-Sep-02 376
2-Sep-02 378
3-Sep-02 415
4-Sep-02 404
5-Sep-02 429
6-Sep-02 391
7-Sep-02 393
8-Sep-02 349
9-Sep-02 373
10-Sep-02 313
11-Sep-02 321
12-Sep-02 309
13-Sep-02 336
14-Sep-02 424
15-Sep-02 457
16-Sep-02 567
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02 157
22-Sep-02 280
23-Sep-02 309
24-Sep-02 392
25-Sep-02 465
26-Sep-02 594
27-Sep-02 618
28-Sep-02 593
29-Sep-02 559
30-Sep-02 543
1-Oct-02 463
2-Oct-02 531
3-Oct-02 574
4-Oct-02 562
5-Oct-02 579
6-Oct-02 527
7-Oct-02 480
8-Oct-02 351
9-Oct-02 372
10-Oct-02 305
11-Oct-02 395
12-Oct-02 413
13-Oct-02 380
14-Oct-02 378
15-Oct-02 194
16-Oct-02 98
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1-Feb-03 3
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8-Feb-03 71
9-Feb-03 74
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1-May-03 112
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