This study reexamines and updates an original bioeconomic model of optimal duck harvest and wetland retention by Hammack and Brown (1974, Waterfowl and Wetlands: Toward Bioeconomic Analysis. Washington, DC: Resources for the Future). It then extends the model to include the nonmarket (in situ) value of waterfowl and the ecosystem service and other amenity values of wetlands in addition to the value of ducks to hunters. The focus is the prairie pothole region of Western Canada. Results indicate that wetlands and duck harvests need to be increased relative to historical levels, confirming Hammack and Brown's original conclusions. Including amenity values leads to a significant increase in the quantity of wetlands and hunters’ harvests of ducks relative to models that focus only on hunting values.