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Upon conducting research, it appears that the boat ramp named Knights Bridge is located on the Clackamas River, specifically in the city of Oregon City, Oregon. The ramp is described as a concrete, single-lane boat ramp, which is suitable for smaller watercraft. According to the latest information available, the ramp is approximately 14 feet wide, which offers sufficient space for launching and retrieving boats.

The Clackamas River is a popular destination for fishing and recreational boating, and Knights Bridge boat ramp is a convenient access point for those who wish to explore the river. The river is approximately 83 miles long and is a tributary of the Willamette River, which flows through western Oregon.

As for the types of boats that are permitted on the river, it appears that there are no restrictions on the type of vessel that can be launched from Knights Bridge boat ramp. However, due to the narrowness of the ramp and the relatively shallow waters of the Clackamas River in some areas, it is recommended that only smaller boats, such as canoes, kayaks, and small motorized boats, be launched from this location.

In conclusion, Knights Bridge boat ramp is a concrete, single-lane ramp located on the Clackamas River in Oregon City, Oregon. It is approximately 14 feet wide and is suitable for launching smaller watercraft. The Clackamas River is a popular destination for fishing and recreational boating, and there are no restrictions on the types of boats that can be launched from this ramp, although smaller vessels are recommended.