Updated October 2017
Beam setting scheduled for Cedar Avenue bridge Tuesday, September 26
Overnight work will include intermittent, minor trail impacts
Crews are scheduled to set bridge beams at Cedar Avenue (County Road 152) the evening of Tuesday, September 26. To minimize impacts to trail and road users in the area, this work will occur over-night, and is expected to be complete by early morning the next day.
The greenway trail will be closed for short intervals (30 minutes or less) while individual beams are put into place and secured. Flagging crews will be present to guide trail traffic to ensure the safety of trail users and crew members.Beams for the Portland Avenue (County Road 35) bridge are also scheduled to be set in a similar fashion the first week in October.
Projects remain on schedule for late-November completion
Work on both bridges remains on track to have the roads reopened to traffic towards the end of November, as originally planned.
Setting the bridge beams is a major landmark and indicates the beginning of the final stretch of construction. Once the beams are set, crews will begin to install the bridge deck, then pavement, sidewalks, railings, and other finishing touches before the bridge is reopened to traffic.
Compared to the labor and time-intensive work of setting the bridge foundation and building the piers and abutments, this next phase of work will move relatively quickly. All work and timelines are weather-dependent and subject to change.
Bridge deck going in at Cedar week of October 16
Next week, crews will begin constructing the bridge deck at Cedar Avenue (County Road 152). This work involves constructing a form that will be filled with concrete, creating the bridge deck andtravel surface. This work is expected to be complete towards the middle of the week of October 16, weather permitting. The concrete bridge pour and paving will follow soon after.
Expect minor trail impacts during bridge deck work
To help keep trail users and crew members safe, there may be temporary trail realignments and impacts during the deck work. Flaggers will be present to direct trail traffic as needed, including some very short-term trail closures while materials are being moved directly over the path. Commuters and trail users should allow extra time to get to their destination if traveling on the greenway.
Trail closure at Portland expected week of October 23
A full closure of the greenway trail is expected to occur during the week of October 23 for crews to complete installation of a new watermain pipe that will cross beneath the trail. This closure is expected to last five days, with the trail reopening by end-of-day Friday, October 27.
During this closure, trail traffic should follow the marked detour:
- Park Avenue (existing bike lane for southbound, temporary contraflow bike lane for northbound)
- East 28th Street (temporary two-way protected bike lane on south side of street)
- 5th Avenue South (shared roadway use)
To minimize trail impacts, crews also plan to install the bridge deck at Portland during this closure. This work is all weather-dependent and subject to change.
PHOTOS: Setting Cedar Avenue bridge beams, September 27
A special 450-ton crane was brought in to set the bridge beams at Cedar. An even larger 550-ton crane will be brought in to set the beams at Portland next week. These are some of the largest mobile cranes readily available in the state.
Each one of the bridge beams at Cedar are manually guided into place to within a quarter-inch accuracy. The beams are intentionally built with a slight bow (or camber). When the extra weight of the bridge deck is applied, they straighten out. This increases the strength of the bridge by accommodating for the added stress that will be applied to the beams from the weight of the bridge deck and traffic.
Each beam is custom-made for the specific conditions of individual bridges. Each of the 13 beams for the Cedar Avenue bridge is about 95 feet long and weighs around 58,000 pounds.