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Location Canada, Manitoba
Central coordinates 97o 7.82' West  50o 10.26' North
IBA criteria A4i, A4iii
Area 6,700 ha
Altitude 233 m
Year of IBA assessment 2008

Bird Studies Canada/Nature Canada

Site description Situated approximately 30 km north of Winnipeg, Oak Hammock Marsh is a man-made freshwater marsh restored from a remnant of the former St. Andrews Bog and marginal agricultural land. Beginning in 1967, Manitoba Natural Resources, Ducks Unlimited, the federal government, volunteer conservation organizations and local landowners began the restoration. It is a very flat area characterized by a series of dykes, water basins and artificial islands, which are managed to provide wetland habitat. Water enters the wetland by artesian wells and through Wavey Creek, then flows south through the man-made basins, and empties out of the marsh into Parks Creek, a tributary of the Red River. The area is about one-third wetlands and two-thirds uplands. The vegetation is a mix of grasses, sedges, and other herbaceous plants Phragmites communis, cattails and bulrushes are among the more common plants. The uplands contain substantial amounts of lure crops that are managed for waterfowl, as well as the only treed area, a small bluff of oaks and aspens in the southeastern corner.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Snow Goose Anser caerulescens passage  1996  250,000 individuals  A4i  Least Concern 
Canada Goose Branta canadensis passage  1995  200,000 individuals  A4i  Least Concern 
Short-billed Dowitcher Limnodromus griseus unknown  1985  5,000 individuals  A4i  Least Concern 
A4iii Species group - waterbirds passage  100,000-499,999 individuals  unknown  A4iii   

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Oak Hammock Marsh Wetlands of International Importance (Ramsar) 3,600 protected area contained by site 3,300  
Oak Hammock Marsh Wildlife Management Area 3,488 protected area contained by site 3,600  


IUCN habitat Habitat detail Extent (% of site)
Forest Temperate deciduous woods  -
Shrubland Scrub  -
Grassland Edaphic grassland; Steppe & dry calcareous grassland  -
Wetlands (inland) Bogs; Freshwater marshes/swamps; Rivers  -
Artificial - terrestrial Arable land; Urban and industrial areas  -

Land use

Land-use Extent (% of site)
nature conservation and research major
hunting major
tourism/recreation minor
water management major

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Oak Hammock Marsh WMA. Downloaded from on 01/09/2014

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