After conducting research, it appears that there is no specific information available about a boat ramp named Highway 90 Alternate 4882 in Eagle Lake, Texas. It is possible that this ramp may not exist or may have a different name.

However, there are several boat ramps located in Eagle Lake that may be of interest:

- The Eagle Lake Recreation Area Boat Ramp is located at 285 Recreation Road in Eagle Lake. This ramp services Eagle Lake, a 1,400-acre reservoir located in Colorado County. According to the Texas Parks and Wildlife Department, this ramp is "wide, paved, and in good condition." It is suitable for launching most types of boats, including bass boats, ski boats, and pontoon boats. There is no fee to use this ramp.
- The Bernardo Beach Boat Ramp is located at 3271 County Road 209 in Eagle Lake. This ramp also services Eagle Lake and is operated by the Lower Colorado River Authority. It is a "two-lane concrete boat ramp with a maximum depth of 10 feet," according to the LCRA website. This ramp is suitable for launching most types of boats, including kayaks, canoes, and small fishing boats. There is a $5 fee to use this ramp.

It is important to note that the information provided above is accurate as of the time of writing (August 2021). However, it is always a good idea to verify information with the appropriate authorities before visiting a boat ramp, as conditions may change over time.