The Department of Transportation is in discussions with the governor’s office regarding whether Federal Emergency Management Agency funds or other disaster aid should be sought to repair roads damaged in Tuesday night’s flooding, DOT spokesman Bill Boynton said Thursday.

“From the DOT’s end, we’re still assessing damage and trying to come up with dollar numbers for the damage,” Boynton said.

The threshold to apply for FEMA funds is $1.6 million, Boynton said, adding it appears the total damage to state roads is close to that.

Heavy rain during a thunderstorm Tuesday night washed out roadways throughout the Monadnock region, closing seven state roads. Centre Street in Sullivan was hit the worst and could be impassable for weeks, Boynton said.

“It’s hard to get to one lane open, when you don’t have any lanes. That’s where they are there,” he said.

A three-quarter-mile strip of Sullivan Centre Street in both Keene and Sullivan remains impassable. Crews are working to establish rough access to isolated residences, which is the priority, Boynton said.

“We’ve got to get in there with a private contractor and essentially rebuild the road. It’s a little bit more than repairing washouts. That’s not a quick fix there,” Boynton said.

FEMA funds could also be used to repair damaged city and town roads, he said.

Another hard-hit area was Gilsum; Route 10 from the Keene town line to the Marlow town line was closed. It has since opened to restricted traffic, which means only emergency vehicles and residents are allowed to pass. That stretch of Route 10 could be weeks away from reopening, Boynton said.

However, he added, “Things are looking promising in a number of areas ... A lot of work was done yesterday and this morning.”