After conducting research on the Rush Island Lake boat ramp in Minnesota, the following information was found:

- The boat ramp at Rush Island Lake is a concrete ramp with a gravel parking lot. It is maintained by the Minnesota Department of Natural Resources (DNR).
- The width of the boat ramp is not specified in available sources.
- Rush Island Lake is a 239-acre lake located in Aitkin County, Minnesota.
- The lake is open to all types of boats including motorized boats, canoes, kayaks, and sailboats. However, there is a 10 horsepower limit for motorized boats.

The information presented here is accurate as of the time of writing. It is important to note that regulations and conditions at Rush Island Lake may change over time, so it is always advisable to consult up-to-date sources for the most accurate information.