CALDWELL - Federal officials say it's too early to tell if an increase in the size of no-wake zones for boaters at a wildlife refuge in southwest Idaho had a positive effect on a bird that nests in shallow water.

Deer Flat National Wildlife Refuge Manager Annette de Knijf tells the Idaho Press-Tribune that a biologist did a survey on western grebes at the refuge this year but results aren't yet known.

The refuge that contains Lake Lowell is one of three places in Idaho where the western grebe has been known to nest successfully.

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Federal officials two years ago approved a plan to increase the no-wake zones that angered some local residents concerned about limits to recreation.

De Knijf says the no-wake zones try to balance recreation for humans with the refuge's responsibility to help wildlife.