Town of winhall
115 Vermont Route 30
Bondville, VT 05340
Request for Proposals ~ Culvert Project
October 1, 2019
The Town of Winhall is seeking proposals for the design and installation of a culvert to replace an existing culvert
located on Cranberry Hill within the Town of Winhall, Vermont.
Cranberry Hill Culvert:
7 feet high
16 feet wide
50 feet long
80 square feet of waterway area
Design and construct a replacement structure (plans must be engineered and stamped)
Road is a dead-end with several residents; temporary roadway or access alternatives required
Must meet applicable regulations and hydraulic standards
State permitting will be the responsibility of the contractor in conjunction with the Town of Winhall
Pre-bid meeting attendance will be required
Pre-bid meeting will be held on-site on Wednesday, October 23, 2019 at 10:00AM
Responses to this Request for Proposals should consist of:
1) A letter expressing interest in working with the Town of Winhall on this project.
2) A description of the approach to be taken to carry out the proposal (specific to above-mentioned list).
3) Documentation of relevant experience, qualifications, and licenses.
4) Proposed fee structure, including total project cost.
5) Timeline, benchmarks, and anticipated completion date.
6) Traffic Control Plan(s) and Signage Plan(s).
Period of Performance
Multiple contracts may be awarded for work associated with this RFP. Work shall commence after July 1, 2020.
Proposals from interested parties must be received by the Winhall Town Administrator no later than 1:00PM on
Monday, November 18, 2019. Submissions must be emailed to: email@example.com. Pr oposals will
be evaluated based upon the contractor’s experience, background, and ability to perform the requested services at
an affordable price. Cost will not be the sole determining factor in the award of this contract. The Town of Win-
hall reserves the right to reject any proposal that does not meet the criteria specified in this RFP, is received after
the deadline, or is not complete. The Town of Winhall reserves the right to reject any and all proposals if ade-
quate funding is not available. The Town of Winhall also reserves the right to seek clarification from any con-
tractor that submits a proposal.
Submit all submissions and direct all inquiries to:
Lissa Stark, Town Administrator
Town of Winhall
115 Vermont Route 30
Bondville, VT 05340
Telephone: (802) 297-2119
VT AGENCY OF TRANSPORTATION
PROGRAM DEVELOPMENT DIVISION
Chris Taft, District 1 Project Manager
Lissa Stark, Town Administrator
Leslie Russell, P.E., Hydraulics Project Manager
27 July 2016
SUBJECT: Winhall TH 50 Culv 5 (Cranberry Hill Road) over Red Brook
GPS coordinates: N 43.1569° W 72.8829°
We have completed our hydraulic study for the above referenced site, and offer the following
information for your use:
This site has a hilly to mountainous drainage basin. It is a mixture of forest, fields, and ponds. The
total contributing drainage area is about 1.7 sq. mi. There is an overall length of 21,570 feet from the
divide to the site, with a 980 foot drop in elevation, giving an average overall channel slope of 4.5%.
The stream slope at the site was estimated to be about 2%. Using several hydrologic methods, we
selected the following design flow rates:
Annual Exceedance Probability
Flow Rate in Cubic Feet per Second
230 - Local Road Design Flow
340 - Check flow
This is a perennial brook. The channel is moderate gradient and incised and alluvial. There is likely
some coarse sediment transport at the site. Field measurements of bankfull width varied from 12’ to
16’. The Vermont Hydraulic Geometry Relationships anticipate a bankfull width of 17’ for stream
channels in equilibrium at this watershed size. Those curves may not be valid for this size drainage
The existing structure is a 5’ diameter pipes that provide a waterway area of 19.6 sq. ft. The pipe is
rusted and deteriorating under the road.
Our calculations, field observations and measurements indicate the existing structures do not meet the
current standards of the VTrans Hydraulic Manual nor does the existing structure meet state stream
equilibrium standards for bankfull width (span length). The existing structures constrict the channel
width, resulting in an increased potential for debris blockage. Headwater to depth ratios exceed
allowable values established in the current VTrans Hydraulics Manual. Water overtops the just at the
In sizing a new structure we attempt to select structures that meet both the current VTrans hydraulic
standards, state environmental standards with regard to span length and opening height, and allow for
roadway grade and other site constraints.
Based on the above considerations and the information available, we recommend any of the following
structures as a replacement at this site:
1. A concrete box with a 16’ wide by 7’ high inside opening. The box invert should be buried 2’.
That will result in a 16’ wide by 5’ high waterway opening above streambed, providing 80 sq. ft.
of waterway area. Bed retention sills should be added in the bottom. Sills should be 12” high
across the full width of the box. So the top of the sills will be buried 12” and not be visible. Sills
should be spaced no more than 8’-0” apart throughout the structure with one sill placed at the inlet
and one at the outlet. The box should be filled up to the stream bed level with stone graded to
match the natural stream bed material. This structure will result in a headwater depth of 2.6’ at
4% AEP and of 3.5’ at 1% AEP, with no roadway overtopping up to 1% AEP.
2. Any similar structure with a minimum clear span of 16’ and at least 80 sq. ft. of waterway area,
that fits the site conditions, could be considered. Any structure with a closed bottom should have
bed retention sills and a buried invert as described above.
Prior to any further action toward implementation of any of the above recommendations, structure size
and type must be confirmed, and may be modified, by the VT ANR River Management Engineer to
ensure compliance with state environmental standards for stream crossing structures.
Other regulatory authorities including the US Army Corps of Engineers may have additional concerns
or requirements regarding replacement of this structure.
If a new box is installed, we recommend it have full headwalls at the inlet and outlet. The headwalls
should extend at least four feet below the channel bottom, or to ledge, to act as cutoff walls and prevent
It is always desirable for a new structure of this size to have flared wingwalls at the inlet and outlet, to
smoothly transition flow through the structure, and to protect the structure and roadway approaches
from erosion. The wingwalls should match into the channel banks. Any new structure should be
properly aligned with the channel, and constructed on a grade that matches the channel. A new
structure should span the natural channel width.
Stone Fill, Type II should be used to protect any disturbed channel banks or roadway slopes at the
structure’s inlet and outlet, up to a height of at least one-foot above the top of the opening. The stone
fill should not constrict the channel or structure opening.
Please note that while a site visit was made, these recommendations were made without the benefit of
a survey and are based on limited information. The final decision regarding replacement of this
structure must comply with state regulatory standards, and should take into consideration matching
natural channel conditions, roadway grade, environmental concerns, safety, and other requirements.
Please contact us if you have any questions or if we may be of further assistance.
cc: Scott Jensen, A.N.R. River Management Engineer
Hydraulics Project File via NJW