Demolition of the old Clarks Bridge on Lake Lanier in Gainesville has started, but the work shouldn’t affect traffic flow across the new bridge, which is next to the old one. Also, boat traffic shouldn’t be affected, as “a barge is working under the bridge to catch debris,” Georgia Department of Transportation district spokeswoman Teri Pope said Wednesday. The 57-year-old bridge’s driving surface will be removed in 10-foot sections first.