DWR_2668862

• Title: STREAM FLOW DATA FOR COLORADO
• Year: 2006
• Document Type - Publications and Reports: Streamflow Report

15
PLATTE RIVER BASIN

06706000 NORTH FORK SOUTH PLATTE RIVER BELOW GENEVA CREEK AT GRANT, CO

LOCATION.--Lat 39°27'26", long 105°39'29" in NW¼ sec. 10, T.7 S., R.74 W., Park County, Hydrologic Unit
10190002, on left bank at Grant, 1,550 ft downstream from Geneva Creek, and 1.3 mi downstream from east
portal of Harold D. Roberts tunnel.

DRAINAGE AREA AND PERIOD OF RECORD.--127 mi²; 1948 to present.

GAGE.--A graphic water stage recorder and satellite monitoring equipment in a wooden shelter over a concrete
well at a concrete trapezoidal channel section and spillway. The gage has power and is equipped with
heat lamps and tapes to prevent freezing of the stilling well and intakes. The station is owned and
maintained by the Denver Water Department. The satellite equipment is owned by USCOE and maintained by
the USGS.

REMARKS.--The primary record is hourly data taken from satellite monitoring with chart back up. The record is
complete and reliable except for periods during the days of March 30, 2006 and September 23, 24, and 25,
2006, when the chart recorder clock stopped and there were hours from the satellite record when data was
either missing or bad. These missing values were estimated without loss of accuracy by interpolation
between periods of good data, and noting that the GH range recorded by the stopped chart was only a few
hundreths of a foot. Rapid changes in stage are caused by the regulation of Roberts Tunnel, ½ mile
upstream. When Roberts Tunnel is operating, the gage is free from ice. The record is good. Station
maintained and record developed by Garver Brown.

RATING TABLE.--PLAGRACO12 USED FROM 01-OCT-2005 TO 30-SEP-2006

DISCHARGE, IN CFS, WATER YEAR OCTOBER 2005 TO SEPTEMBER 2006
MEAN VALUES

DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP

1 165 118 50 47 44 47 61 46 678 522 346 92
2 162 119 53 47 45 46 61 151 684 525 303 76
3 194 119 54 47 45 47 61 296 685 517 229 79
4 217 97 53 47 45 48 63 299 680 442 150 78
5 220 80 53 47 45 48 68 301 682 386 114 75
6 218 82 53 47 44 49 66 302 678 399 134 81
7 171 83 52 47 45 48 63 271 670 433 129 86
8 143 67 51 47 45 48 64 275 683 493 115 68
9 116 55 51 47 45 46 69 366 685 442 137 77
10 99 55 51 47 45 46 84 408 687 288 218 65
11 85 55 51 47 45 45 90 402 682 152 316 60
12 75 54 51 46 45 45 121 443 687 194 375 58
13 75 53 51 45 45 44 201 477 690 446 381 53
14 79 54 50 45 45 45 254 482 691 660 315 55
15 80 44 49 45 45 45 272 486 691 652 206 56
16 79 47 49 45 45 44 266 539 686 637 126 54
17 101 54 49 44 45 44 271 565 686 634 76 52
18 122 51 49 44 45 44 265 561 687 633 179 51
19 124 54 49 45 45 44 259 576 695 601 302 51
20 124 52 49 45 45 44 262 561 690 598 292 51
21 122 53 50 45 45 44 318 519 683 558 279 56
22 122 53 51 45 45 44 393 530 686 486 217 58
23 122 51 51 44 44 44 400 570 703 476 168 56
24 122 49 51 45 45 44 393 596 682 426 165 56
25 121 48 51 44 45 44 341 661 693 387 162 57
26 122 50 51 44 45 44 315 655 692 398 144 58
27 121 51 51 44 46 44 319 657 669 385 125 57
28 121 48 51 44 47 45 225 667 645 310 120 56
29 122 47 51 44 --- 46 45 663 611 251 141 54
30 120 49 51 44 --- 46 44 656 542 305 203 52
31 115 --- 51 44 --- 55 --- 666 --- 347 138 ---

TOTAL 3979 1892 1578 1408 1260 1417 5714 14647 20303 13983 6305 1878
MEAN 128 63.1 50.9 45.4 45.0 45.7 190 472 677 451 203 62.6
AC-FT 7890 3750 3130 2790 2500 2810 11330 29050 40270 27740 12510 3730
MAX 220 119 54 47 47 55 400 667 703 660 381 92
MIN 75 44 49 44 44 44 44 46 542 152 76 51

CAL YR 2005 TOTAL 44883 MEAN 123 MAX 607 MIN 23 AC-FT 89030
WTR YR 2006 TOTAL 74364 MEAN 204 MAX 703 MIN 44 AC-FT 147500

MAX DISCH: 806 CFS AT 10:15 ON Jun. 23, 2006 GH 2.09 FT. SHIFT -0.05 FT.
MAX GH: 2.09 FT. AT 10:15 ON Jun. 23, 2006

FOR MORE COMPLETE OR DETAILED INFORMATION SEE DAILY OR MONTHLY RECORD.