Specifications. 3278. Earthwork and structures, superior lateral system, laterals 3.7, 4.2, 6.2, 9.5, 12.5, 13.9, 14.9, 15.3, 16.3, 17.5, 18.4, 19.9, 21.2, 21.9, 22.6, 23.7, 27.3, 28.3, 28.9, and 29.3, sublaterals, drains and channel changes, Superior-Courtland unit, Bostwick division, Nebr.-Kans., Missouri River Basin project.