The discovery of the water-willow stem borer moth at Mill Pond in West Tisbury could have a big impact on brook conservation.

Seven years after it was first proposed, a project meant to improve the water quality and ecosystem at the Sheriff’s Meadow Roth Woodlands has yet to get underway.

The North Tisbury bridge, West Tisbury’s narrow pass over the Mill Brook, could soon be widened. Planning board administrator Jane Rossi presented a new concept for the bridge to the select board Wednesday afternoon.

A $15,000 state grant announced this week will go to the Sheriff’s Meadow Foundation to replace two undersized culverts on the brook in Chilmark.

The West Tisbury Mill Brook watershed management planning committee has completed its work on the Mill Brook watershed study.

In a new report, Greg Whitmore, an entomologist, identified 62 species of macroinvertebrates in the Mill Brook.

Mill Brook has been the topic of intense study and debate in recent years, much of it focused on Mill Pond. The freshwater river system provides some of the only cool-water fish habitat on the Vineyard.

A plan by a prominent Vineyard conservation group to restore the Mill Brook headwaters in Chilmark has run into fierce opposition from a nearby resident who says it conflicts with decades of observation.

A spirit of collaboration prevailed Monday evening at a forum that begins a yearlong study of the Mill Brook watershed. The 3,700-acre watershed includes the historic, much-discussed Mill Pond near the center of town.

The Mill Brook watershed management planning committee will hold the first of several public forums on Monday, Sept. 29, at 5:30 p.m. at the West Tisbury library.