Virginia Smith Dam

Overview
Virginia Smith Dam is in an area of northwest-southwest trending sand dunes in which the Calamus River has cut a wide, shallow valley.  The abutments of the dam were constructed in sand dunes that occur to the northeast of about station 69+50 and to the southeast of about station 29+00.  Relief of individual dune ridges ranges between 30 and 70 feet.  The valley section between about station 29+00 and about station 69+50 contains fluvial deposits of the present-day Calamus River and an older fluvial sequence deposited before the present river system was established.  The modern Calamus River system consists of the river channel, flood plain and low terrace that occur between low escarpments near station 34+00 and station 43+50.  The older portion of the valley occurs between the margins of the predominant dune ridges and the low scarps mentioned above.  Between about station 43+50 and station 69+50 on the southeast (left) side of the valley, and about station 29+00 and about station 34+00 on the southwest (right) side of the valley.  Fluvial deposits and buried peat occur in these areas, but are masked by about 5 to 20 feet of fine, eolian sand reworked from dune sand and flood plain deposits.

General
RegionFacilities in Great Plains | Great Plains Home Page
StateNebraska
CountyGarfield and Loup
ProjectPSMBP-North Loup
Dam Type
ReservoirCalamus River
WatercourseCalamus River
Location
Longitude-99.2000
Latitude41.8333
Original Construction1985
Modified Construction
National ID NumberNE82904
Hydrologic Unit Code

Dimensions
Structural Height96.00 ft
Hydraulic Height (Normal Operating Depth at Dam)74.00 ft
Top Parapet (Elevation)
Spillway Crest Elevation
Crest Elevation2259.00 ft
Crest Length147.0 ft
Crest Width
Base Width
Volume of Dam Construction Materials
Streambed at Dam Axis2170.0 ft
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)2244.0 ft
Top of Inactive Conservation Pool (Elevation)2213.3 ft
Top of Dead Storage Pool (Elevation)2185.0 ft

Hydraulics & Hydrology
Volume
Total Water Storage at Elevation
Maximum Water Surface Elevation
Normal Water Surface Elevation2244.0 ft
Spillway Type
Auxiliary SpillwayNo
Spillway Capacity at Elevation3080.0 cfs at 2252.8 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation2080.0 cfs at 2252.8 ft
Diversion Capacity at Elevation
Drainage Area147.00 sq mi
Hydrometeorological Report (HMR)HMR
Probable Maximum Flood (PMF) Report

Contact Information
Owner
TitleArea Office Manager
OrganizationNebraska-Kansas Area Office
Address1706 West Third
CityMcCook, NE 69001
Phone (Office)308-345-4400
Phone (Fax)308-345-6470
Operator
OrganizationTwin Loups Irrigation District
AddressPO Box 98
CityScotia, NE 68875
Phone (Office)308 245-3171


Last updated: Apr 08, 2013