Private pleasure boats on the nation's inland waterways and seacoasts are creating traffic jams wherever launching ramps are found. More ramps are needed, and for obvious reasons most of them will be constructed of concrete. Most ramps are constructed of concrete placed on site, precast concrete planks, or a combination of the two. Depending on local conditions, it may be desirable to place concrete on site above water level and use precast planks below water level. The most satisfactory cast-on-site concrete boat ramp is at least 5 inches thick and has a 28 day compressive strength of not less than 3,000 psi. Ordinary methods of pavement construction are suitable for the parts of the ramp above water, with concrete placed after side forms have been carefully leveled. Concrete should be placed in the forms beginning at the lower end and proceeding uphill. When the concrete is reasonably level, ti should be compacted with one pass of a vibrating screed worked slowly back and forth. Use of a scraping straightedge to remove slight surface defects is preferable to hand-floating, since floating is likely to bring laitance to the surface. The surface should be textured with a domestic yard broom to provide traction for motor vehicles towing trailers up the ramp. The pattern of grooves left by brooming should be finer than that normally used for highway construction, and should not be so coarse as to cause distress to people walking on the ramp with bare feet. The use of precast concrete planks facilitates construction of a launching ramp. Planks can be used either for that section of the ramp below water of for the entire ramp. The flat planks rest on longitudinal ties solidly placed in the base material. The planks are held in position by U-bolts connected through loops of reinforcement projecting through the plank. All exposed steel of these planks must be protected against corrosion. Concrete must be throughly compacted and adequately cured.