BRYANT POND — An engineer’s evaluation of the century-old Lake Christopher dam has judged the structure to be in fair to poor condition.

While it does not appear in danger of imminent failure, its deficiencies “pose a certain risk for reliable operation during normal conditions and, especially during significant 10-to-25 year, and extreme 50-to100-year flood events,” a report said.

The report was prepared for Woodstock selectmen by MBP Consulting of Portland, and was reviewed by the board at their meeting last week.

The town has been putting aside funds to repair the dam, adding $100,000 to the $15,000 fund at the March 26 town meeting. No formal estimate of the repair cost has been calculated.

Among his findings, engineer Myron Petrovsky said the dam leaks at a rate of 300 to 600 gallons per minute, which, he said, “may also influence the lake level during the prolonged dry seasons.”

He described the left spillway sidewall as “severely deteriorated and eroded,” while a concrete wing wall adjacent to it was broken at the corner and had moved toward the pond.

The spillway sidewalls, he said, “are not able to contain the flow during modest flood events, causing frequent overtopping of the walls and erosion of the embankments.”

Petrovsky also said that the roots of large trees are penetrating the embankment, while trees growing on the downstream slope are displacing and dislodging masonry.

He concluded his report with recommendations for a three-phase repair project on the dam, including further inspections and surveys and a conceptual design; a preliminary design and permitting process; and repair construction.

In the meantime, he said, the town should cut and remove trees, brush and logs from around the dam, repair eroded areas with stone and clear road culverts below the dam.

Selectman Ron Deegan suggested the town aim to complete the project over the next two years, and choose an engineer to oversee the work.

In other business at last week’s board meeting, Selectman Rick Young raised the question of whether to buy a used grader to replace the the town’s 32-year-old one. He said he had seen a $16,000 one available at an auction.

The board also discussed the option of contracting the grading work. “The question is whether to sink $16,000 into a grader, or let someone else have all the headaches,” Young said.

Town Manager Vern Maxfield updated the board on plans to improve the Concord Pond Road, possibly by putting down a six-inch layer of three-inch diameter packed rock.

Voters approved money for the work at town meeting.

“As long as we have a sizable chunk of money, we might as well do as good a job as we can, as far as we can go,” Maxfield said.

He also reported there will be a change in the schedule for this year’s New England Performance Rally race through Woodstock on the Concord Pond Road. Rally cars will pass through the area around noon, rather than at suppertime. He said the change should please nearby residents.

“The biggest complaint was that the road was closed from 3 to 7 p.m,” he said.

He also reported that another tour of the Spruce Mountain LLC wind project is expected to take place Memorial Day weekend.