I had a woman friend who hit a pothole on the freeway in San Antonio once. Cracked and bent 2 rims, and the city didn't do anything about it. She tried to get the city to settle, and they denied her claim. She called the local news (they had one of those show where citizens aired complaints and the news station investigates) and she had a check in 4 days from the city.
My suggestion? Get the media involved. The city will realize that if they don't settle (and quickly) they might be faced with quite a few claims they'll have to pay out for the exact same circumstance.
The squeaky wheel gets the grease.
Edit: I saw the "this happened awhile ago" part. You should have contacted the city/county immediately.