Vandalia Diversion Dam

The Vandalia Diversion Dam on Milk River, 3 miles west of Vandalia, MT, is a reinforced concrete slab and buttress weir-type structure with movable crest gates and auxiliary overflow crest. The hydraulic height is 27 feet; the crest length is 2,340 feet. The auxiliary crest, 1,200 feet in length, is located north of Milk River opposite the dam to provide adequate channel for extreme floodflows. The Vandalia Canal diverts on the south side of the river at the dam and conveys water to the land in the Glasgow Division. The canal has a design capacity of 300 cubic feet per second.

RegionFacilities in Great Plains | Great Plains Home Page
ProjectMilk River
Dam TypeReinforced concrete slab and buttress weir, movable crest embankment wing
WatercourseMilk River
LocationOn the Milk River 3 miles west of Vandalia, Montana.
Original Construction1917
Modified Construction
National ID NumberMT00584
Hydrologic Unit Code

Structural Height32.00 ft
Hydraulic Height (Normal Operating Depth at Dam)27.00 ft
Top Parapet (Elevation)
Spillway Crest Elevation
Crest Elevation2,116.00 ft
Crest Length2,350.00 ft
Crest Width
Base Width
Volume of Dam Construction Materials 15,200 cu yds
Streambed at Dam Axis
Top of Exclusive Flood Control Pool (Elevation)
Top of Joint Use Pool (Elevation)
Top of Active Conservation Pool (Elevation)
Top of Inactive Conservation Pool (Elevation)
Top of Dead Storage Pool (Elevation)

Hydraulics & Hydrology
Total Water Storage at Elevation
Maximum Water Surface Elevation
Normal Water Surface Elevation
Spillway TypeMovable overflow crest. Auxiliary crest
Auxiliary Spillway
Spillway Capacity at Elevation300.00 cfs at 2,116.00 ft
Auxiliary Spillway Capacity at Elevation
Uncontrolled Spillway Capacity at Elevation
Outlet Works Capacity at Elevation
Diversion Capacity at Elevation
Drainage Area
Hydrometeorological Report (HMR)
Probable Maximum Flood (PMF) Report

Contact Information
TitleArea Manager
OrganizationMontana Area Office
AddressP.O. Box 30137
CityBillings, MT 59107-0137
Phone (Fax)406 247-7338
Phone (Office)406 247-7300
OrganizationParadise Valley Irrigation District
AddressPO Box 1417
CityChinook, MT 59523
Phone (Office)406 265-8269

Last updated: Apr 02, 2013