Enfer Teton SuitBOISE (AP)—The Idaho Water Resource Board and an irrigation company have officially entercxl the* suit seeking an injunction against Lower Teton Darn construction*The Water Board asked Thursday to appear as a friend of the court so it could have the ffop* parmnity of informing the court of the official position of Hie State of Idaho/*The North Fork Reservoir Co. asked to intervene as a defendant so that it can represent Its seven canal companies which cover a total of 39,866 irrigated acres.Environmental groups are seeking to halt construction of the eastern Idaho project.A hearing is scheduled for Monday before U.S. District Judge Fred M. Taylor in Boise.