FLOOD03557

• County: Grand
• Community: Granby
• Stream Name: Tenmile Creek
• Basin: Colorado Mainstem
• Title: Granby Community File
• Date: 1/1/2001
• Prepared For: CWCB
• Prepared By: CWCB
• Floodplain - Doc Type: Community File

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Granby Dam is a zoned earthfi 11 dam whi ch was closed on September 14,
1949. The total storage at normal high water elevation of 2523.74 m
(8280 ft) is 6.66 by 108m3 (539 758 acre-ft) and covers a surface
area of 29.4 km2 (7260 acres). In addition, Willow Creek Pump Canal
and Chute provide a total of 11.3 m3/s (4 ft3/s) at a total dynamic
head of 53.3 m (175 ft) into Lake Granby. Active storage between
elevations 2495.09 m (8186 ft)--out1et intake invert--and 2523.74 m
(8280 ft) is 5.74 by 108m3 (465 568 acre-ft). (See exhibits 9
and 10.) Dikes No.1, 2, and 4 are continuous and close low areas west
of Granby Dam. Dike No.3 closes a saddle about (2 km) 1 mile southeast
of the dam.

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CHAPTER II - STRUCTURAL, MECHANICAL, AND ELECTRICAL

A. General Description of the Dam

The construction data on the dam and dikes are as follows:

Dimensions

Dike No.
1, 2, and 4

Dam

Structural height
Hydraulic height
Top width
Maximum base width
Crest length
Crest elevation
Total volume

91 m (298 ft)
70 m (231 ft)
12 m (40 ft)
462 m (1515 ft)
262 m (861 ft)
2526.79 m (8290)
2 273 920 m3
(2 974 000 yd3)

6-30 m (20-98 ft)
Offstream
9 m (30 ft)
37-122 m (120-400 ft)
1350 m (4430 ft)
2526.79 m (8290 ft)
760 395 m3
(994 500 yd3)

Dike
No. 3

18 m (60 ft)
Offstream
9 m (30 ft)
198 m (649 ft)
608 m (1994 ft)
2526.79 m (8292 ft)
568 862 m3
(744 000 yd3)

NOTE: Stations mentioned in this chapter include metric conversions:
meter (feet).

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