2016 The First Beipanjiang (Duge) Bridge in China, as of 2023, World's Highest

(Satellite)

reduper
It cost US$146m. "Duge Bridge is famous for its height exceeding Sidu River Bridge, setting a record for the world’s highest bridge."
The length is 1341.4m (0.8 mile) with a main span of 720m (0.45 mile). "The height of the bridge tower on the Guizhou side and the Yunnan side is 269 meters [883'] and 247 meters [820'], the vertical distance from the bridge surface to the river surface is 565.4 meters [1,855'], and the vertical distance from the top of the bridge tower to the river surface is 740 meters [2,248']. There are 112 pairs of 224 cable stays in the bridge."
In addition to World's Highest, as of 2018, it "was the world's largest cable-stayed bridge with steel truss beams." (I've noticed that most cable-stayed bridges use box girder decks.)
It shortened the travel time between Xuanwei and Shuicheng from more than four hours to less than one hour.
Highway Engineering Discoveries posted
World Highest Bridge
The Duge Bridge , also called the Beipanjiang Bridge, is a four-lane cable-stayed bridge on the border between the provinces of Guizhou and Yunnan in China.As of 2021, the bridge is the highest in the world, with the road deck sitting over 565 metres (1,854 ft) above the Beipan River. The bridge is part of the G56 Hangzhou–Ruili Expressway between Qujing and Liupanshui. The eastern tower measures 269 m (883 ft), making it one of the tallest in the world.
Highway Engineering Discoveries posted
Cable stayed Bridge China 😍

Sir David Attenborough Club posted

The world’s highest bridge stands a dizzying 565 meters over a river valley.

More details/photos: https://bit.ly/3P4WoM3

Photo via HighestBridges
Duge Bridge is "the first cable stayed bridge to ever hold the title of The World’s Highest Bridge." It also has "the third longest steel trussed cable stayed span."
[This web page has many photos, including a sequnce that shows how a travelling gantry built the deck from truss segments.]

Highway Engineering Discoveries posted

China

 Beipanjiang Bridge is a super large bridge connecting Yunnan Province and Guizhou Province in China.

Diagram via HighestBridges
"Today the Province of Guizhou is home to more high bridges then every other country on earth combined. By 2030 Guizhou will have more then 1,000 bridges over 100 meters high as measured from the road or rail deck to the water. Compare that with Italy which has the world’s second greatest number of high bridges with only 60 spans exceeding 100 meters in height. Of the world’s 50 super-high spans that exceed 300 meters from deck to water, all are in China except for 3."

G.A.B. Relu B., Dec 2020
Also in AtlasObscura, HIGHESTBRIDGES/CC BY-SA 4.0

Shakylsles CC BY-SA 4.0 via AtlasObscura
"Chicago’s Sears Tower would fit under the Beipanjiang Bridge with 400 feet [122m] to spare."
It is so high because "the designers kept having to move the final location of the bridge higher and higher to avoid caves and cracking in the karst mountains at either side of the valley."
(One of the sources said that the river carved the canyon in a limestone mountian. I learned while studying Hales Bar Lock & Dam that limestone mountians do not make good foundations.)

Nickey.com posted
Construction of the World's Highest Bridge in China. See More:
https://nickeyscircle.com/duge-bridge-in-china/

Highway Engineering Discoveries posted

Bridge Construction in China

Dennis DeBruler: Duge Bridge, currently the world's highest bridge.

https://www.reduper.com/industry/traffic/bridge/river-bridge/duge-bridge/

1925,1986+2009 MO-240 Bridges over Missouri River at Glasgow, MO

Highway: (Archived Bridge Hunter; Historic Bridges; Satellite)

The adjacent bridge is the C&A Bridge.

Missouri's Historic Highways posted two photos with the comment: "Glasgow Bridge."

1
[Note the powerline towers. HistoricBridges explains: "One additional overlooked detail to note about this bridge is it had unusual riveted towers on top of the truss which held electrical wires. This was an unusual feature, and since the towers appeared to be riveted and original, they were a significant and unique historic detail."]

2

wikiwand
"The Glasgow Bridge was five-span through truss bridge over the Missouri River on Route 240...It was built in 1925 and rehabilitated in 1986. Its main span was 343.7 feet [104.8m] and its total length was 2,243.5 feet [683.8m]. It had a deck width of 20.3 feet [6.2m] and vertical clearance of 14.8 feet [4.5m]. It was narrowed to a single lane in its final few years (with stoplights on either side) before being closed and replaced in 2008-09. The new bridge reopened in September 2009 and the project was completed in autumn of that year."

krcgtv
"Thu, 24 Sep 2009 11:27:16 GMT — The Missouri Department of Transportation has re-opened the Missouri River Bridge at Glasgow. The bridge has been closed since August of last year [over a year] for structural repairs. That forced commuters either to take a ferry across the river, or drive hundreds of miles out of their way to get to the other side."

MoDOT did an economic impact of the closure. The traffic volume was 1,198 vehicles per day. [MoDOT]

Missouri State Archives Flickr, public domain
Pouring the concrete floor on the Missouri River bridge at Glasgow.

rasmussengroup
Only the superstructure was replaced. The original piers were reused. Reusing the piers would explain why this $14m project closed the bridge for over a year.
"The main river span is a three-span continuous parallel flange steel plate three girder superstructure system. The approach spans were also steel plate girders."

WillettHofmann
[I wonder how long it took to clear the navigation channel.]
The girders were 9'2" (2.8m) tall.

MoDOT did document the bridge before they blew it up.

HistoricBridgeFoundation, p1

A good view of a high-voltage power line tower. Note that a lower voltage power line was cantilevered from the side. The railroad bridge on the right is still standing.

HistoricBridgeFoundation, 100, rotated

2022 2.2km (1.4 mile) Tseung Kwan O – Lam Tin Tunnel in Hong Kong

West portal: (Satellite, it was still under construction when I accessed it.)

East portal: (Satellite)

I've seen spaghetti interchanges before, but this is the first time I've seen an interchange deep in a hole. This interchange is the connection of the west portal of this Tseung Kwan O – Lam Tin Tunnel (tko-ltt) on the right with the east portal of the Cha Kwo Ling(CKL) Tunnel, which is still being built, on the left. The ramps coming up from that tunnel-to-tunnel connection provide access to the Eastern Harbour Crossing Tunnel and the local roads. This hole also contains ventilation and administration buildings.

td.gov.ky

tko-ltt_overview

The east portal is easy to understand. It simply connects to the west end of the Tseung Kwan O Cross Bay Bridge.

tko-ltt_photos, Dec 2022

Another view of the west portal. Effectively, they are building a new expressway in a tunnel along the bay. But here they daylight that new tunnel to build an interchange with the local roads and the existing Eastern Harbour Crossing Tunnel. By daylighting, I mean they dug a hole in the hill down to the grade level of the new tunnels.

tko-ltt_photos, Dec 2022

The satellite map caught them still digging the hole.

Satellite

I zoomed into the lower-left part of the above to show the temporary bridge for a haul road. Look at the queue of trucks waiting to backup and dump dirt directly into a barge.

Satellite

They plan to add a lot of landscaping. Evidently the greenery helps suppress the road noise.

roadtraffic-technology
"The tunnel is being constructed using either the mechanical method or the conventional drill and blast method, depending on geological conditions and site constraints."

I think the whole tunnel was done with the drill and blast method. I saw no evidence that a tunnel-boring-machine was built for these bores. I did see evidence that blasting was done.

aurecongroup
"Aurecon utilized the GIS platform to map out the location of the buildings that might get affected by the drill and blast work."

aurecongroup
"Aurecon's Steven Haslemore proposed a spatial solution that replaced the manual drill and blast calculations being conducted by the team."

Another vision of the landscaping. When I saw that an interchange on the east side of the tunnel was built over water, it occurred to me that blowing away the side of a mountain is one way to get the needed land in a very dense urban area.

LeightonAsia

Unlike some of the very impressive infrastructure work that China is doing in the western part of the country, the rush hour traffic on the bridge that connects to this tunnel shows that there is heavy traffic in this area.

Highway Engineering Discoveries posted via Dennis DeBruler

2022 1.8km (1.1 mile) Tseung Kwan O Cross Bay Bridge over Junk Bay in Hong Kong

(Satellite, 2,126 photos)

This page has several photos of the bridge.

Highway Engineering Discoveries posted
Hong Kong
Dennis DeBruler: It opened to traffic Dec 11, 2022.
https://www.google.com/maps/@22.2962038,114.2572203,2050m/data=!3m1!1e3?entry=ttu

"The Tseung Kwan O Cross Bay Bridge in Hong Kong, a main part of the Cross Bay Link, opened to traffic on Dec 11[, 2022]....With a total length of about 1.8 kilometers, the 35.8-meter-wide bridge has a 200-meter-span external-floating butterfly-shaped steel main arch....It's worth noting that the arches of the bridge were built with S690 steel, the first time the ultra-high-duty steel was widely used in bridge construction in the world. In addition, it was the first time the float-over method was used in bridge erection in China." [sasac]

cgtn, Xinhua
"The bridge is the first marine viaduct in Hong Kong with a carriageway, a footpath, a cycle track and viewing platforms at the same time."
"The steel bridge components were prefabricated in the mainland, and the about 200-meter-long bridge was delivered to Hong Kong from Nantong, eastern Jiangsu Province."

neccontract
"The NEC-procured crossing forms part of a new 5.6 km highway between Kwun Tong and the Tseung Kwan O development area, which includes a 2.2 km tunnel east of Lam Tin."
"The centrepiece of the crossing is a 200 m span steel bridge with two inclined tied arches. This 10,000 t structure and its two 100 m steel side spans were manufactured over 1,600 km away in Nantong and erected by float-over technology onto their respective piled piers. Off-site manufacture was also used for most of the remaining 600 m of reinforced concrete viaducts. All pile-cap shells, V-shaped and vertical piers, and 50−75 m long box-girder deck spans were cast in Guangdong and installed span by span with up to 5,000 t capacity floating cranes. "

GlobalPhotos, this is one of many photos taken during this stage of construction.
"The Cross Bay Link is a 1.8km bridge across Junk Bay. Construction began in 2018 and is expected to finish by 2022. It is only a section of a much longer highway all the way to Yau Ma Tei, with the bridge connecting to the Tseung Kwan O - Lam Tin Tunnel also under construction to Kowloon. Another branch heads into Tiu Keng Ling."

cblsbtko
A significant fraction of the deck is allocated to landscaping and non-vehicle traffic.

 

aecom
"The 656-foot (200-meter) double-arch steel bridge, which weighs about 9,843 long tons (10,000 tonnes) and is over 131.23 feet (40 meters) high, was prefabricated in Nantong, China."

TheStandard
The arch was delivered in Hong Kong on Feb 16, 2021.

This is the largest double-arch bridge in the world ever erected using the float-in method. They had to worry about the tides as well as the ballasting in the barge. [hewson-consulting]

The Chinese don't always build the fanciest design.

archello

cblsbtko
The project includes a non-vehicle bridge, Southern Bridge,  to provide a complete pedestrian walk around Junk Bay.

This Sourthern Bridges was installed using a crane rather than the float-in method.

hewson-consulting

2019 13km Nansha (南沙大桥) Bridge over Pearl River in Guangdong Province

(Satellite) (Chinese:南沙大桥)  The previous name was Humen Second Bridge.

The crossing consists of two suspension briges and helical ramps to provide access to the Hai'ou Island.

newsgd, Photos: Humen Second Bridge Branch Office of Guangdong Provincial Highway Construction Co., Ltd
"On April 2nd, 2019, the [13km] Nansha Bridge, formerly known as the Humen Second Bridge, was officially opened."
"The Nansha Bridge comprises two cross-river mega-span suspension bridges. For the first time globally, the project involves two cross-river suspension bridges with their respective main spans exceeding 1,000 meters [3/4 mile]. The Dasha Waterway Bridge is a twin-tower single-span suspension bridge with a main span of 1,200 meters. The Nizhou Waterway Bridge is a twin-tower double-span suspension bridge with a main span of 1,688 meters [1 mile], making it the largest steel box girder suspension bridge in China."

I do not understand what they mean by "double-span" above. I can find only one span for the longer bridge. I noticed that the waterway is indeed busy.

Satellite

It "cost more than 11 billion yuan ($1.64 billion)." [ChinaDaily]

newsgd, Photos: Humen Second Bridge Branch Office of Guangdong Provincial Highway Construction Co., Ltd
Construction started in 2014.

mageba-group
The bridge not only has the world's longest steel box girder span (1,688m or 1 mile), it's the widest steel box girder suspension bridge at 40.5m (133').

The entrance and exit for the island use helical roads to change between street and bridge level. I see very few cars on those 2-lane ramps. Although America would also have two lanes, but one of them would be a shoulder. 

Taly posted
Nansha Bridge Guangzhou China
Anas Hanif Bhatti posted
Nansha Bridge Guangzhou, China
Treon Jooce Jackson: This can't be China though. Cars go the opposite way on the road. They travel forward on the left not the right.
Berkeley Littlejohn: Treon Jooce Jackson Hong Kong/Macau drive on the left, Mainland China drives on the right.
Highway Engineering discoveries posted
Nansha Bridge Guangzhou, China

I looked closely at this photo to check the occupancy of the ramps. Then I realized that the photo above is a cropped version of this photo. I also found this photo on Twitter.

黃思凱, Apr 2023

The helical ramps get a "Spaghetti" award.

Satellite

newsgd, Photos: Humen Second Bridge Branch Office of Guangdong Provincial Highway Construction Co., Ltd
The project set several records for continuous pours for both surface and volume jobs.

Structurae has some construction photos.

1966 East Canyon Reservoir Dam on East Canyon Creek ndar Morgan, UT

(Satellite)

usbr
"The new dam, with a height of 260 feet, a top thickness of 7 feet, crest length of 436 feet, and a volume of 35,716 cubic yards, replaces an old concrete arch dam and increases the reservoir capacity from 29,000 to 51,200 acre-feet, covering a surface area of 684 acres. The uncontrolled spillway is on the left end of the dam and has a 6,200-cubic-foot-per-second capacity; the outlet through the dam has a capacity of 710 cubic feet per second."

Jun 2023:

KUTV 2News posted
SPILL OVER: 🌊 East Canyon Reservoir appears to be FULL! Look at all that water.. look at all that green!!! 🟢
📸: Chad Hawkes, via kutv.com/chimein

It looks like the white part has been covered up and the brown part has turned green.

Satellite

It is good to see the years-long drought in the West is having some relief.

KUTV 2News posted in Jul 31, 2021
UTAH WATER: East Canyon Reservoir water level has dropped close to 50%, exposing the deeper Dam #2 just under the surface. State Park officials say Dam #3 is not yet visible.
Courtesy East Canyon State Park

I couldn't find a date for this photo when it was even dryer.

mapio_1

 

mapio_2

2017 was another wet year.

DesertNews
Before this, it spilled in 2011. The article implies that this flow is just 110cfs. The safe channel capacity is 250cfs, and in 2011 it hit 300cfs. 1:11 video of water spilling