And, as my colleague mentions below, contacting the listing agent would be the best way to find it's location. They are there to represent the seller, so you don't have to worry about an agent roping you in to anything. I will say that if you don't want that agent to represent you, don't share any of your confidential information with that agent. In other words, anything that would be a negotiable point of a purchase agreement (i.e. price, financing, when you'd like to close, etc.). But, don't be afraid to talk to the seller's agent. They are there to provide you with the information you're looking for.
While this won't give you a map, the directions in the MLS are as follows:
I35N PC Exit 169 to 61N to 55 E to "T" R to CR8 follow 8 to Maple Grove N to Northern E to Ridge Rt
This should at least get you closer. I would also try maps.msn.com and then switch to the aerial view. The house that they locate is on the river, but the street name isn't correct. When all else fails you might want to contact an agent to help you further if this is a property you are truely interested in.