Roost proximity to water is highly variable, so probably not as important as once thought. In Indiana, roost trees were discovered less than 660 feet (200 m) from a creek, while roosts in another part of Indiana were 1.2 miles (2 km) from the nearest permanent water source. To the other extreme, roosts of a maternity colony from Michigan were all found in a 12-acre (5 ha) wetland that was inundated for most of the year. In Virginia, foraging areas near a stream were used. Intermittent streams may be located closer to roosts than more permanent sources of water. Ponds, streams, and road ruts appear to be important water sources, especially in upland habitats.