According to the South Dakota Game, Fish and Parks website, the Sunset Road boat ramp in Brookings County is a concrete boat ramp located on Lake Sinai. The website states that the ramp is 40 feet wide and can accommodate most types of watercraft.

Lake Sinai is a 151-acre lake located in Brookings County, South Dakota. The lake is used for fishing, boating, and other recreational activities. The website does not specify any restrictions on the types of watercraft allowed on the lake, but it does state that there is a 5 mph speed limit in place.

The latitude and longitude coordinates provided in the question match the location of the Sunset Road boat ramp as shown on Google Maps. Therefore, it can be assumed that the information provided is accurate.