WILLISTON, N.D. (AP) — The dramatic population growth in the oil patch town of Watford City is fueling demand for housing and commercial space, but city officials are concerned that a lack of infrastructure could get in the way of the booming development. About 2,500 housing units are under construction or permitted to be built in the Watford City area, but the lack of infrastructure "is the roadblock to getting even more built," said Gene Veeder, economic development director in McKenzie County, the state's top oil-producing county. Company principal Israel Weinberger said he expects three apartment buildings to be ready for occupancy this fall, with the end goal being 325 apartments in seven buildings.