Update August 23, 2012: US Highway 69 is now open for you to get to Gilbert from either north or south, and it looks like the resurfacing project has been completed! I’m keeping these instructions posted for the G.W. Carver Ave. alternative route, since it’s such a nice drive.
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If you’re going to Gilbert from Ames, you can take G.W. Carver Ave. north instead – it’s a scenic drive and actually could be shorter, since it comes out closer to Gilbert at Co. Rd. E23.
If you go west on Bloomington Rd. to the west side of Ames, Bloomington turns into G.W. Carver Ave. and curves north. Then (from the Gilbert Gazette): “Follow Carver (R50) about three miles north to the stop sign and turn right onto E23. Travel a half mile east. Once in Gilbert, E23 becomes Mathews Drive. Turn left just before the railroad crossing onto Main Street.”
If you’re heading from a different direction, or just like to see things on a map first, you can find Gilbert on Google Maps.