Barnstable-01

Barnstable, Halls Creek

41.635281, -70.309109

Dimensions: 2.5ft diameter
Condition: Good
Comments: The concrete culvert appeared to be in good condition. The upstream portion of the culvert was not visible; it appeared to be located approximately 2 feet below the invert of the control structure's weir.

Legacy data from previous surveys and documentation

Invasive Species: No
Restoration Status: Not Applicable
Invasive Comments: The upstream impoundment (pond) appeared to be entirely freshwater as evidenced by bank vegetation such as willows. The downstream reach was brackish; the area closest to the downstream culvert opening was mostly comprised of panicum with sections of narrowleaf cattail on the fringe. The downstream channel appeared to transition into more salt tolerant species approximately 300 feet downstream where low marsh was observed.
Restoration Comments: Restoration would not be feasible at this site as the upstream pond is freshwater. Removal of the control structure and enlargement of the hydraulic opening might result in transitioning the freshwater system to a brackish wetland with some tidal influence.

General Comments: Site is located at the Hyannisport Club and easily accessible off of Marston Lane. Note that Marston Lane is private, but there is parking on the shoulder of the road along Marchants Mill Way directly to the south of Marston Lane.
Operation Plan: No
Operation Comments: The operational purpose of the control structure appeared to be for managing the water levels of the upstream pond at the golf course. The pond level could be adjusted for a range of one foot. At the time of the site visit (12/18/2015), the pond was at its minimum level and no stop logs were present in the control structure; however, a staining mark on the concrete indicated that the pond level is likely typically increased by approximately 9.5” during the summer months for aesthetics.
Gate Comments: The concrete control structure on the upstream end of the restriction was fitted for placement of metal stop logs and appeared to be in good condition. No cracking or spalling was observed.

Elevation Comments: The extent of downstream (D/S) tidal influence could not be evaluated as there was no headwall or other prominent point of reference from which to take a measuredown from for later referencing via LiDAR. Staining was evident on the upstream (U/S) end of the culvert at the control structure; however, it appeared that the stain was a result of previous pond management levels rather than tidal influence (i.e. the pond appeared to have no tidal influence and was comprised of all freshwater species). For reference, the U/S stain mark was located 15.5” below the top of the road surface of Marston Lane. The control structure’s invert elevation was able to be assessed. The below lists measurements taken with a surveyors rod from the top of Marston Road and the corresponding top of headwall LiDAR elevations (NAVD88 datum). 1) Control structure Inv (D/S): Top of HW El (U/S) = 5.31’; Inv Measuredown = 2.08’; TG Inv = 5.31’ – 2.08 = 3.23’ 2) Upstream Tidal Influence: N/A 3) Downstream Tidal Influence: N/A