Paradise Diversion Dam


Paradise Diversion Dam was constructed to replace a rock, log and brush dam destroyed by floodwaters in June 1965. The dam, located on the Milk River near Chinook, MT, diverts water for irrigation for the Paradise Valley Irrigation District.

The 200-foot-long concrete diversion structure includes a 100-foot ogee spillway section provided with 5-foot-high removable flashboard supports at 5-foot centers along the crest, abutment walls, wingwalls, and cutoff walls, and a sluiceway equipped with a manually operated 5- by 6-foot cast-iron slide gate. Crest elevation of the spillway is 2390.5. Extending from the right abutment of this concrete structure is a compacted earthfill dike, 20 feet wide at the crest, constructed to elevation 2401.5. A cableway with winch-operated cable car, used for maintenance and for placement of flashboards when required, spans the spillway section of the dam.

RegionFacilities in Great Plains | Great Plains Home Page
ProjectMilk River
Dam TypeConcrete ogee spillway and sluiceway and compacted earthfill dike
WatercourseMilk River
Location On the Milk River 4 miles southeast of Chinook, Montana
Original Construction1966
Modified Construction
National ID NumberMT 00586
Hydrologic Unit Code

Structural Height20.00 ft
Hydraulic Height (Normal Operating Depth at Dam)14.00 ft
Top Parapet (Elevation)
Spillway Crest Elevation 2,390.50 ft
Crest Elevation2,401.50 ft
Crest Length570.00 ft
Crest Width
Base Width
Volume of Dam Construction Materials 5,000.00 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 TypeOverflow crest
Auxiliary Spillway
Spillway Capacity at Elevation
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