Costs have increased more than 20 percent in two key Hall County bridge replacement projects. The Georgia Department of Transportation is now projecting right-of-way acquisition costs to jump to more than $1 million from nearly $800,000 in replacing the Ga. 369/Browns Bridge Road bridge over the Chattahoochee River. And construction of the Ga. 53/Dawsonville Highway bridge over the Chestatee River is now at $12.9 million, compared to an earlier estimate of $10.4 million.