It's a nice little park with boat access to the Missouri River. I've only used the boat launch section while working in the area. The boat launch is gravel but stable.
Here's a description from their website (https://www.mycountyparks.com/county/monona/Park/Huff-Warner-Access-Area.aspx)
"This 5.6 acre park is located 2 miles west of Blencoe on the Missouri River. This park is a popular camping spot just minutes off of I-29 with twenty-five electrical stalls, a boat ramp into the Missouri River, boat dock, dump station, open shelter house, shower house and potable water. Camping fees are $12.00 per night non-electrical and $16.00 per night electrical. We do not take reservations for campsites as it is a first come first serve basis." read more