Based on the latest information available, the Warm Springs Day Use boat ramp in Montana is a concrete ramp that is 16 feet wide. It provides access to the Gallatin River, which is a popular destination for fishing, kayaking, and rafting.

The Warm Springs Day Use boat ramp is located within the Gallatin National Forest and is managed by the US Forest Service. The ramp is open year-round, but access may be limited during the winter months due to snow and ice.

According to the official website of the US Forest Service, the Gallatin River is open to a variety of watercraft including canoes, kayaks, rafts, and motorized boats. However, there are restrictions on the use of motorized boats and jet skis, and users are advised to check with local authorities for the latest regulations.

In summary, the Warm Springs Day Use boat ramp in Montana is a 16-foot-wide concrete ramp that provides access to the Gallatin River. It is open year-round and allows for a variety of watercraft, including canoes, kayaks, rafts, and motorized boats (with restrictions).