Large tracts (>1000 ha) of prairie are essential to the sustainability of grassland ecosystem services, yet in many ecoregions only small fragments remain. Glacial Ridge is among the largest prairie-wetland restorations ever attempted. Started in 2000, the 9000 ha project in northwest Minnesota, USA, was initiated to reconnect 14 small tallgrass prairie remnants. In all, 15,200 ha of contiguous habitat comprise the project’s direct accomplishment. We created a partnership of more than 30 organizations, filled 177 km of drainage ditch, restored 1240 ha of wetland, and replanted 8100 ha. Flooding has been mitigated, water quality improved, and native vegetation reestablished. Animals not documented for decades have again occupied the site. Despite these accomplishments, the project would have been unnecessary if the land had been purchased in the 1970s, prior to conversion to agriculture, at one-tenth the restoration cost. Our challenges related to funding, differences in partners’ restoration philosophy, community concerns about floods and tax losses, difficulties in obtaining seed, and follow-up management of invasive weeds. We summarize the restoration process and share basic principles that will help others to develop large-scale prairie restoration projects in the future.
The Glacial Ridge Project: reconnect a cluster of 14 fragmented prairie-wetland remnants (totaling 5200 ha) by restoring the habitat and hydrology of the 9000 ha core area; [actions involve] plugging (installing a clay “stopper” to prevent flow), filling, compacting, and re-grading previously excavated soil to the greatest extent possible; some of the ditches could not be entirely decommissioned and had to be either diked to restore adjacent wetlands or reconstructed to a more natural configuration while assuring adequate conveyance of runoff
|Climate change impacts||Effect of Nbs on CCI||Effect measures|
|Freshwater flooding||Positive||groundwater recharge, surface-water runoff, discharge/flood peaks|
Glacial Ridge [in Minnesota] lies within the 250,000-ha Agassiz Beach Ridges landscape (Figure 1). The landscape straddles the eastern shorelines of glacial Lake Agassiz