US Army Corps Report – Phase 1 Construction Activities Next 90 Days – September 2015

US Army Corps Report – Muddy River Flood Risk Management & Environmental Restoration Project Phase 1 Construction Activities Next 90 Days

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Continued progress since the last update at the new Riverway culvert area is the waterproofing and backfilling of the culvert; and forming and placing of the southeast concrete wingwall.  Over the next month, we will continue with constructing all the site work in order to put traffic over this culvert for the upcoming traffic shift in mid October.    

At the Upper Fens Pond (UFP) and the downstream Avenue Louis Pasteur (ALP) work areas, all the sediment removal and bank restoration/stabilization have been completed.  Plantings are arriving on site and we will be planting these areas of the project until mid October.

At the upstream ALP work area, we have installed all the steel pipe piles to support the new precast concrete culvert sections.  We will be tying rebar and placing concrete for the pile caps shortly.  The extension piece of precast concrete culvert that is attaching to the junction box may arrive early October.  This extension piece will allow us to “daylight” the river in the area between Upper Fens Pond and Avenue Louis Pasteur.

Thank you for your continued interest and support for this project!


General: The Muddy River Flood Risk Management (FRM) & Environmental Restoration Phase 1 Construction Project is located in the footprint generally between the Riverway downstream to Avenue Louis Pasteur. The major project components involve the installation of a 10-foot by 24-foot box culvert under the Riverway roadway, the installation of 10-foot by 24-foot box culvert under the Brookline Avenue roadway, daylighting of the area between the Riverway and Brookline Avenue, and daylighting of the area between Brookline Avenue and Avenue Louis Pasteur. Daylighting is the removal of existing twin 72″ culverts and excavation of the area to return the waterway to a natural state. This Notice is intended to identify the general construction activities that will be performed in the next 90 days. A figure that shows the existing conditions and the proposed improvements is at the end of this report.

September 2015 through November 2015 Period:

  • In order to continue work on the project, a traffic shift will occur mid October in the intersection of Park Drive and Riverway. This shift will allow the construction of the new left turn onto Park Drive North coming from Riverway. Specific details of this traffic shift will be posted as a Press Release weeks prior to the move.

  • The contractor completed the installation of the Flow Restriction Control Structure (FRCS) upstream of the existing Riverway Intake Structure at the Phase 1 Construction project limits. The FRCS is necessary to control the increased flow that may now be passed through the new precast concrete culverts at Riverway and Brookline Avenue. However, these increased flows are not able to be passed downstream of Avenue Louis Pasteur to the Charles River until the dredging is completed under Phase 2 work. As part of this recent work, the contractor installed a sheetpile cofferdam, which temporarily connects to the FRCS and bisects the river, in anticipation of the sediment removal/bank restoration activities in the upcoming months.

  • In the Riverway Culvert work area, since the precast culverts were installed mid August, the precast headwall has been installed and the southeast (downstream right) wingwall has been formed and placed. The precast culverts have been waterproofed and backfilled. Site work, such as curbs, sidewalks, ramps, and paving, to put traffic over the culverts will take place in September in order to implement the next traffic shift in mid October.

  • A new activity that will begin in the next few weeks is the relocation of a portion of the existing 24” sewer line in the former Sears Parking Lot. The majority of the new sewer line will be installed before the end of this year; with the completion and connection to the existing system expected in early 2016, once the existing twin 72” culverts are abandoned.

  • A continuing activity in the next couple of months, in the area around the former Sears Parking Lot (Park Drive Island, near Brookline Avenue), is the installation of conduits and foundations for the end condition roadway lighting and traffic signals and construction of end state island and walkways. In addition, once the permanent utilities are energized and active in Brookline Avenue, the temporary utilities will be disconnected, which will allow the “daylighting” of the former Sears Parking Lot. Activities related to the daylighting, such as removing the top 4’ of the parking lot and driving steel sheetpile for the river diversion, will begin late this month. Active excavation to construct the southside (right side, looking downstream) of the new river channel will take place in the next few months. Excavation to construct the northside will take place early 2016 once the existing twin 72” culverts are abandoned and the river is flowing through the new culverts and the southside of the constructed river.

  • In early to mid November, the Jug Handle roadway will be removed permanently from service, once the new left turn onto Park Drive North coming from Riverway is constructed and open to vehicular traffic. Closing the Jug Handle roadway will allow the daylighting of this portion of the work area which continues the daylighted portion of the waterway at the former Sears Parking Lot, now connected by the new Brookline Avenue culvert. This daylighted portion of the Jug Handle will feed directly to the Upper Fens Pond as a natural waterway. Advanced notice of the Jug Handle roadway removal will be posted as a Press Release, as well as advanced posted signage, weeks prior to the move.

  • Since the active diversion of the river began in mid-April, the removal of the sediment in the river bottom to construct the new flood risk management channel; and the bank restoration/stabilization on both sides of the channel with stone protection in the Upper Fens Pond has been completed. Geocells have been installed on the upland part of the channel and bank construction is complete. Plantings will begin in mid September and be complete by mid October, during the Fall planting season.

  • Upstream of Avenue Louis Pasteur (ALP), the steel sheeting support of excavation (SOE) has been installed and excavation from within the SOE completed. All the pipe piles were installed before Labor Day; and rebar and formwork will begin for the pile caps and invert slabs mid September. Precast culvert sections may be installed early October, with the forming and placement of both wing walls mid October. Once the extension piece of precast concrete culvert is in place, then the section of existing culvert between the Upper Fens Pond and Avenue Louis Pasteur will be removed and the river “daylighted” to continue the flood risk management channel and the recreation of the historic Olmstead island. Daylighting and the construction of the historic island will take place late Fall through early Winter.

  • Downstream of Avenue Louis Pasteur, the contractor has removed the sediment from the outlet and inside of the existing culvert to construct the new flood risk management channel. The articulated concrete blocks (ACB) for scour protection have been installed; and stone protection and geocells for bank stabilization at this downstream end of Phase 1 Construction is completed. Plantings will begin in mid September and be complete by mid October, during the Fall planting season.

  • At the end of this notice we have included some pictures that show the construction progress in the Riverway Intake Structure; Riverway Culvert; the Upper Fens Pond; and Avenue Louis Pasteur work areas. We thought folks would be interested in seeing the work occurring behind the fence.

  • If you have any questions, require additional information or would like to be added to the Project Contact List, please email the projectmailbox at MuddyRiver@usace.army.mil

September Traffic Patterns and Project Photos

Project Phase 1

(U.S. Army Corps of Engineers photos)