The number of rooms in the U.S. hotel development pipeline continues to drop, according to the April 2011 STR/McGraw Hill Construction Dodge Pipeline Report, released last week by Smith Travel Research. Last month's total of 322,423 rooms represents a 12.2 percent decline compared with last year's number. The upper midscale segment led the way, with 15,536 rooms in construction, but that is just 76 percent of last year's total for the segment. Projects in the pre-planning phase, however, which are not included in the total pipeline numbers, are on the rise. Among those figures are 6,600 proposed luxury rooms and 22,000 potential upscale rooms.