WASHINGTON, June 6  It is no secret that campaign contributions sometimes lead to lucrative official favors. Rarely, though, are the tradeoffs quite as obvious as in the twisted case of Coconut Road.

The road, a stretch of pavement near Fort Myers, Fla., that touches five golf clubs on its way to the Gulf of Mexico, is the target of a $10 million earmark that appeared mysteriously in a 2006 transportation bill written by Representative Don Young, Republican of Alaska.

Mr. Young, who last year steered more than $200 million to a so-called bridge to nowhere reaching 80 people on Gravina Island, Alaska, has no constituents in Florida.

The Republican congressman whose district does include Coconut Road says he did not seek the money. County authorities have twice voted not to use it, until Mr. Young and the district congressman wrote letters warning that a refusal could jeopardize future federal money for the county.