Ground, water and winter in Winfield
The county soil survey lists low strength, frost action and shrink-swell as the road limits on the loess and till uplands here, and flags wetness, flooding and shrink-swell on the Mississippi flood plains. Both call for the same answer: crushed rock in the base and water moved off to ditches and culverts.
Bids are only comparable when they spell out the same things: base depth, compacted thickness, how edges are finished, and where water is meant to go. Ask for those before you pick a number.
Compacted asphaltTypically 2 to 3 in. for a car drive
Stone baseTypically 4 to 8 in., compacted
Drive on itUsually 2 to 3 days, longer in heat
First sealcoatTypically 6 to 12 months after paving
Typical ranges. Your Winfield estimate is sized to the soil, the traffic and the drainage on your property.