It is largely projects over $10,000 go out for public bidding, generally with sealed bids. For most State or Federal level stuff you can see who the bidders wer

It is largely projects over $10,000 go out for public bidding, generally with sealed bids. For most State or Federal level stuff you can see who the bidders were, and what bid won the contract. Municipal or County level projects probably have so much variability that it's hard to make any definitive statement.