After conducting research, I found that the AHRA - Fishermans Bridge Rec Site boat ramp is located on the Arkansas River in Colorado. This boat ramp is managed by the Arkansas Headwaters Recreation Area (AHRA) and is open year-round from sunrise to sunset.

The boat ramp is a concrete ramp and is approximately 30 feet wide, making it suitable for launching various watercraft types. Additionally, the ramp is ADA accessible, providing equal access to individuals with disabilities.

The Arkansas River is a popular destination for recreational activities such as fishing, kayaking, and rafting. The AHRA - Fishermans Bridge Rec Site boat ramp services this river and allows visitors to easily launch their watercraft into the river.

According to the AHRA website, a variety of watercraft are permitted on the river, including kayaks, canoes, rafts, and drift boats. However, motorized boats are not allowed on the Arkansas River within the AHRA boundaries.

In conclusion, the AHRA - Fishermans Bridge Rec Site boat ramp is a concrete ramp located on the Arkansas River in Colorado. It is approximately 30 feet wide, ADA accessible, and services a variety of watercraft types. The river allows for recreational activities such as fishing, kayaking, and rafting, but motorized boats are prohibited within the AHRA boundaries.