Blowing past state officials’ financial projections, three construction contractors submitted bids for the Oroville Dam repairs that begin at $275 million, the Department of Water Resources said Saturday. DWR, in a brief announcement, said its engineers had estimated the repairs to the two damaged spillways would come in at $220 million. The low bid was $275.4 million from a subsidiary of Kiewit Corp. of Omaha, Neb.; followed by an affiliate of Barnard Construction Co. of Bozeman, Mont., at $277 million. The high bid was made by Oroville Dam Constructors, a joint venture between Sacramento’s Teichert Construction and Granite Construction of Watsonville, at $344.1 million.