DWR_2668867

• Title: STREAM FLOW DATA FOR COLORADO
• Year: 2008
• 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.--Data Collection Platform (DCP), shaft encoder and a continuous chart recorderin a wooden shelter over a
concrete well at a concrete trapezoidal channel section and spillway. The gage has electric power and
is equipped with heat lamps and tapes to prevent freezing of the stilling well and intakes. Gage is
owned and maintained by the Denver Water Dept.

REMARKS.--The primary record is hourly averages of 15-minute satellite data with chart back up. The record is
complete and reliable, except for periods when Roberts’s Tunnel was off and the gage was affected by
ice: November 3-9, 14, 15, 17, 20-29, 2007, March 18-25, 28, April 1, 2, 4, 5, 8, 11-13, 17, 18, 25, 27,
May 2, 3, 2008. Rapid changes in stage are caused by the regulation of Roberts Tunnel located ½ mile
upstream. When Roberts Tunnel is operating, the gage is free from ice. The record is good, except
during periods of ice affected record, which are estimated and fair. Station maintained and record
developed by Mike Wild.

RATING TABLE.--PLAGRACO12 USED FROM 01-Oct-2007 TO 30-Sep-2008

DISCHARGE, IN CFS, WATER YEAR OCTOBER 2007 TO SEPTEMBER 2008
MEAN VALUES

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

1 54 34 56 91 79 66 20 57 463 618 273 54
2 54 33 65 91 79 66 21 45 554 611 270 50
3 52 32 75 91 79 66 22 45 632 604 271 66
4 51 46 87 92 79 66 20 44 641 596 269 77
5 51 42 95 92 79 66 20 63 630 591 268 71
6 49 31 95 92 79 66 21 130 647 607 272 53
7 48 30 95 92 79 66 21 151 687 534 277 46
8 46 30 95 92 79 66 20 221 666 460 250 50
9 47 30 94 87 79 66 21 260 644 467 214 53
10 46 31 94 80 79 65 21 261 649 452 224 53
11 45 31 95 80 79 66 20 253 653 440 228 56
12 45 31 95 80 79 65 20 263 645 432 272 93
13 45 29 95 80 79 65 20 262 658 424 317 72
14 49 29 95 80 79 53 25 257 660 415 313 63
15 50 30 93 79 79 40 32 204 672 411 324 55
16 48 31 95 79 79 41 35 161 665 448 332 50
17 48 30 95 78 79 28 28 165 683 485 238 44
18 41 29 95 78 79 20 30 176 621 492 118 45
19 44 28 93 77 79 20 31 201 672 418 79 47
20 46 30 92 77 79 20 40 261 665 352 69 47
21 43 30 92 77 78 20 42 296 661 348 67 47
22 37 30 92 77 72 20 43 336 648 383 63 44
23 46 30 92 77 68 20 55 399 644 433 65 41
24 42 25 92 77 67 20 58 436 638 545 72 40
25 39 25 92 78 67 21 50 431 637 620 72 39
26 37 25 92 79 67 21 41 450 630 618 68 39
27 37 25 92 79 66 22 38 384 622 614 62 39
28 36 30 92 79 67 22 41 368 624 517 58 39
29 35 35 92 79 67 21 48 408 624 412 56 108
30 35 44 92 79 --- 21 51 415 622 397 55 171
31 35 --- 92 79 --- 20 --- 432 --- 329 54 ---

TOTAL 1381 936 2806 2548 2199 1305 955 7835 19157 15073 5570 1752
MEAN 44.5 31.2 90.5 82.2 75.8 42.1 31.8 253 639 486 180 58.4
AC-FT 2740 1860 5570 5050 4360 2590 1890 15540 38000 29900 11050 3480
MAX 54 46 95 92 79 66 58 450 687 620 332 171
MIN 35 25 56 77 66 20 20 44 463 329 54 39

CAL YR 2007 TOTAL 50031 MEAN 137 MAX 621 MIN 10 AC-FT 99236
WTR YR 2008 TOTAL 61517 MEAN 168 MAX 687 MIN 20 AC-FT 122000

MAX DISCH: 725 CFS AT 00:15 ON Jun. 18, 2008 GH 1.95 FT. SHIFT 0.01 FT.
MAX GH: 1.95 FT. AT 22:45 ON Jun. 6, 2008

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