I can't speak for your specific area much, but there are some generalities that should apply:
The further up in elevation the less waterfowl/more "local" they will be.
Main flyways/populations are near saltwater and larger valleys.
If there's agriculture there usually are at least some birds nearby.
Good hunting can be found away from these areas, but you'll have to put in time and effort to find small ponds and backwaters that consistently hold birds.
