December 16, -- Workers completed the 1000th concrete ring. You can see the connected concrete liner rings beind them in this photo.
November 19, 2019 -- At the retrieval shaft near Foster Park a dusty road get's swept and a second dewatering tank arrives and is placed in the construction zone. That tanks assist with groundwater in the shaft.
Novemeber 18, 2019 -- Man basket and pump ready for lowering at retrieval shaft.
November 6, 2019 -- Mamajo made 3/4 of a mile and is at the first drop shaft located at East Central Park. Photo shows Rock Bolt installation at Retrieval Shaft.
October 31, 2019 – Equipment being lowered into the Retrieval Shaft to assist with pump installation.
October 23, 2019 – Crews build security fencing on the north side of the Retrieval Shaft.
October 16, 2019 – Workers at the Retrieval Shaft (Foster Park) are drilling a hole for dewatering services.
October 9, 2019 – Worker securing a rock bolt at the Retrieval Shaft.
September 10, 2019 – Work continues at the Retrieval Shaft (Foster Park) as it continues its downward construction. Photo shows worker examining the progress at an elevation of 650.5 above sea level.
August 14, 2019 – Work is progressing at locations throughout the route. The night photo shows crews at the pump shaft (Dwenger & Glasgow) hanging pipe brackets down the wall. Inside the tunnel crews continue to work as MamaJo moves forward.
August 8, 2019 – Work continues at the neighborhood drop shafts, the shafts will intercept flow that currently goes to the river and drop it down to the tunnel. In this photo, grouting work is going on at drop shaft 6 near the Camp Allen Drive at West Main Street.
July 25, 2019 – MamaJo under the Maumee near the Hosey Dam today. Several members of the media visited to observe the progress.
July 13, 2019 - Above ground photo shows concrete liners in the distance and inside MamaJo you can se the liners going in place.
July 9, 2019 - Worker being lowered into the 65-foot diameter pump station shaft and photo of Mamajo's used cutterheads and new ones that will be used to continue cutting through the bedrock.
July 8, 2019 -- Rock removed after blast at retrieval shaft in Foster Park.
July 5, 2019 -- Photos below show sections of the concrete liner in place, pieces of liner ready for installation and a view inside MamaJo.
June 26, 2019 -- Work is simultaneious throughout the route of the tunnel. From working shaft at Dwenger Avenue to the drop shafts along the five mile route to Foster Park -- site of the retrival shaft pictured below.
June 25, 2019 -- Installing rail system extension.
June 24, 2019 -- As MamaJo moves further away from the Working Shaft -- the rails system is essential to take workers to their daily job. The bottom photo shows a flatbed with concrte tunnel lining segments.
June 22, 2019 -- Photo below is looking down the drop shaft located at Headwaters Park West. There are 7 dropshafts along the five mile route of the tunnel. Drop shafts will deliver combined sewage to the tunnel where it will flow to the wastewater plant for treatment. It keeps the combined sewage out of the river.
June 20, 2019 -- Follow MamaJo's story on the new Story Map. Cleic this link MamaJo Story Map
June 18, 2019 -- What does the reconstruction of Huffman Street, just off Wells, have to do with the tunnel? The stone crushed and pulled out of the tunnel by MamaJo is the perfect fill for a road project and prevents us from spending extra to buy the fill rock. Huffman had a sewer separation project and this week; crews are reconstructing the street that was torn up for restoration. The first photo is looking west from Wells Street, and the second is looking east from Short Street.
June 14, 2019 -- Photos show the additional slurry circuit installed and the segments being delivered via rail car into the tunnel for unloading. 
June 13, 2019 -- Permeneant vent line was installed and is now connected to the gantry 12 (end of MamaJo, the Tunnel Boring Machine).
June 6, 2019 – MamaJo workers are extending the slurry lines and isecond photo looks down working shaft as final piece of MamaJo is in place. (photos at working shaft - Dwenger Avenue)
June 4, 2019 - Worker inside MamaJo installs segment ring in tunnel at Dwenger Avenue.
June 3, 2019 – First holes being drilled at Foster Park retrieval shaft.
May 30, 2019 Lots of work going on around town -- below truck dlivers equipment to retrieval shaft at Foster while crews are lining the drop shaft at Camp Allen, just south of Main Street in second photo.
May 29, 2019 - Workers scaling retrieval shaft walls at the Foster Park location.
May 9, 2019 - Work continues as MamaJo moves forward to continue adding on the additional gantries. This week's photos show crews connecting Gantry 6 and the unloading of additional liner segments.
April 19, 2019 -- MamaJo's first cut into bedrock. Click on this link to see sheared rock coming out. MamJo's first cut into bedrock April 19 Click on this video for animation Animation shows cutterhead working
April 15, 2019 -- Gantries move the concrete liner pieces forward on a conveyor. Each piece will be attached amd connected to make a ring. Click on this link to vide annimation of how it works. Animation - How segments connect
April 1, 2019 -- View of iner pieces #2 and 3 are attached. These are the precast concrete ppieces we tshowed in earlier photos. Once attached, they have an inside diameter of approx. 16-feet.
March 27, 2019 - Photo below shows first liner pieces being connected. Crews are working in the Tunne Boring Machine.
March 20, 2019 -- Photo below shows the gantries placed in the pump station area. The pump station is just east of the working shaft where parts of Mamajo are already connected. Gantries house the segment feeder to transport the concrete liner pieces forward for installation. Gantries also house the slurry pump, control cabinet, the bentonite supply system and hydraulic pumps.
March 12, 2019 -- Photo below shows three parts of Mamjo connected and preparing for the five mile journey.
February 11, 2019 - Last week two pieces of Mamajo were send down the working shaft. The photo below shows the machine after some of the connections were placed.
February 4, 2019 -- Construction crews began lowering MamaJo through the working shaft on Dwenger Avenue. High winds and sub-zero temperatures delayed lowering Mamajo, because of the weight of the cutterhead – 200 tons. Finally, Mamajo was lowered down the 220-foot working shaft. Here are two videos of the lowering and a photo below. Click: MamaJo lifted to begin journey Click: Mamjo sits over Working Shaft before lowering
December 18, 2018 -- Work continues on getting Mamajo ready to dig. This photo shows the concrete linner pieces that will be instlaled as Mamajo progresses. The 5X7 foot pieces connect to become the tunnel liner.
October 25, 2018 -- Work continues at the working shaft and pump station shaft as well as the neighborhood drop shafts. All but one of the drop shafts are under construction. This photo shows the equipment in place at the intersection of Berry and Thieme.
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September 21, 2018 -- Work is beginning on the drop shaft in west central this week. Six of the seven neighborhood drop shafts are now under construction. CLICK here to see VIDEO of recent MamaJo tour 9-9-18
September 10, 2018 -- A message from MamaJo: "Thanks to all of you who came out to meet me on Sunday, September 9 -- and gosh there were a lot of you. I'll NEVER remember all your names. You might have had to wait a long time to see me, but I hope it was worth it and that you didn't get too cold. I've heard it can get really cold here in the winter so I'm looking forward to going underground before winter weather hits.
If you had your picture taken with me, please click here to download photos. Our photographers are uploading the photos today and it may take a little time, so please be patient. Thanks again for visiting me and I'm looking forward to keeping you updated as I prepare for my undergound journey."
September 7, 2018 -- MamaJo is ready for visitors on Sunday May 9 from 11 a.m. to 3:00 p.m. The tour takes about 35 minutes. Please -- no flip-flops. The tour will be by trolley with three stops. It takes about 35 minutes. Parking is in front of the Pollution Control plant near the trolley boarding area.
August 31, 2018 -- Tour MamaJo on September 9. Crews are working to get her ready for your visit. Also, crews are busy working on drop shafts near Headwaters Park West and near Guildon park. Clik on the links to view videos.
Prepping Mamajo, Drop Shaft at Michaels Ave - Gilden Park, Flyover view of MamaJo
August 7, 2018 - Today City Utilities unveiled the name for the 400-feet long Tunnel Boring Machine – MamaJo! Voting was cast earlier this year and the name, MamaJo won with more than 43% of the vote. In addition, you will be able to see MamaJo in person! On Sunday, September 9, from 11:00 a.m. to 3:00 p.m. at the working shaft site near the intersection of Dwenger and Glasgow Avenue, City Utilities will be hosting tours of the site. More information to come.
