WSPC05752

• File Number: 8402.400.10
• Description: Platte River Basin-River Basin Basic Hydrology-Transmountain Diversions Imports-Blue South Platte
• State: CO
• Basin: South Platte
• Water Division: 1
• Date: 1/1/3000
• Title: Blue South Platte Project 1942-1955-Exhibit B
• Water Supply Pro - Doc Type: Report/Study

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Rams Horn Tunnel extends from the aforementioned flume at the east

end of the Aspen Creek Siphon to the headworks of the Marys Lake penstock,

Station 775 160.00 to Station 8W~ 184, a distance of 6924 feet and has a

oarrying capecity of 550 second feet. It is a concrete lined horseshoe sec-

tion 10' 0" inside diemeter. The bearing of the centerline is N. 500 57' H.

from Station 775 160 Ah. The inlet portal of said tunnel at Station 775 1

60.0 bears South 160 0' East, a distance of 2063.7 feet from the Northwest

corner of Section 10, T. 4 N., R. 13 W., 6th Principal Meridian and the Out-

let portal at Station 844 1 84 bears South 490 49' West a distance of 4302.2

feet' from the northeaat corner of Section 2, T. 4 N., R. 73 W.,-6th Principal

Meridian.

Marys Laka Penstock has its beginning at Station 845 1 80, located

96 feet from tha outlet portl\l of Rams Horn Tunnel. The penstock has a

96-inch inside diameter and is designad to operate under a maximum head

of 201.5 feet, with a oapacity of 550 cubic feet per second. It enter~ the

Marys Lake Power Plant at Station 850 146. The bearing of the penstock

oenterlL~e is the same as said Rams Horn Tunnel extended N. 500 57' E. In

order to by-pass water aroun~ the penstook, a three barrel siphon spillway

structure on the right side oonveys spilled water to Narys La\{e. A fixed

gate controls the flow into the penstock.

Marys Lake Power Plant is located on the southwest side of Marys Lake

at Station 850 f 80 whioh point is on an extension of the Rams Horn Tunnel

centerline and which point bears South ~o 37' West a distance of 3706.4 feet

from the Northeast corner, Section 2, T. 4 N., R. 73 W., 6th Principal Meridian.
The power plant is a reinforced concrete building 62 feet wide by 64 feet long
and will house one main generating unit and station-service equipment. Said
main generating unit will be a 8100 kw vertical-ehaft generator directly con-
nected to a 11,300 hp. hydraulic turbine. Water paseing through the power
plant will discharge directly into Marys Lake.
Marys Lake is formed by the construction of dikes along the east
(Dike No.1) and south (Dike No.2) shores of the existing Marys Le~e. Each
dike has a crest width of 30 feet and a orest aievation of 8050 faet. Said
dikes are eaoh compcsed of a rolled embankment with a reinforced ooncrete