 If voters give their approval, it will cost the average homeowner more than $250 a year more in property taxes. In all, the plan is worth more than $1.5 billion over eight years. At Seattle City Hall, Jeff Podula, Northwest News Radio. The State Transportation Commission has approved raising toll rates on the 520 Bridge. Starting August 15th, the cost across the lake will jump by an average of 10% with the price depending on the time of day. Deputy Director Carl See.