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Based on the available information, the East Mann Lake Access boat ramp is located at latitude 42.77666473 and longitude -118.44028473 in Oregon. This boat ramp is designed for motorized boats and provides public access to Mann Lake, which is a relatively small body of water located in the southeastern part of the state.

The East Mann Lake Access boat ramp is reported to be approximately 12 feet wide, which should be sufficient for most small to medium-sized watercraft. However, it may be important for boaters to exercise caution when launching or retrieving their boats, especially if the ramp is crowded or busy.

As for the types of boats permitted on Mann Lake, the latest information available suggests that motorized crafts such as powerboats, jet skis, and other recreational vehicles are allowed. However, it is always a good idea to check with local authorities or park officials to verify any specific rules, regulations, or restrictions that may apply to boating activities on this body of water.