China-Vietnam Border Bridge Milestone Boosts Connectivity

A critical bridge on the China-Vietnam border expressway has completed its structural closure, marking the full through-connection of the Tianma Expressway and adding a major transportation artery linking China’s Yunnan Province to the border at Tianbao Port. The milestone promises to nearly halve travel times and significantly boost cross-border trade capacity.

Major Engineering Achievement

On June 28, 2026, the Malutang Super Major Bridge (马鹿塘特大桥) on the Tianma Expressway (天麻高速) successfully completed its closure in Malipo County, Wenshan Prefecture, Yunnan Province, according to CCTV News. The bridge spans 1,005.5 meters with a main span of 480 meters, making it a twin-tower, double-cable-plane, semi-floating system steel-concrete composite girder cable-stayed bridge.

Standing at 254 meters at its highest tower — equivalent to an 80-story building — the bridge was built on near-75-degree steep canyon slopes with complex geological conditions including fault fissures, rock fragmentation zones, and ancient landslide bodies. Construction took over 910 days, with workers achieving millimeter-precise对接 (docking) of the bridge deck.

Yu Shuangming (于双铭), Chief Engineer of the Malutang Bridge Work Area, described the challenge: “This is like driving foundation piles in a pile of crushed stone — extremely difficult.” He noted that it is “currently the bridge with the largest span, the highest tower, and the most complex construction environment in Wenshan Prefecture,” as reported by Changjiang Daily.

Engineering Innovations

The project team deployed advanced construction techniques to overcome the difficult terrain. Cao Linxiang (曹林祥), Project Manager of CCCC Second Highway Engineering Bureau, explained that the bridge tower construction introduced an intelligent climbing formwork system combined with GPS 3D positioning technology, enabling real-time全天候 (round-the-clock) correction of pouring deviations and strictly controlling overall construction误差 (error) within 3 millimeters.

Forty-eight foundation piles were driven deep into rock layers, and 152 high-strength stay cables provide the bridge’s structural support.

Environmental Stewardship

The bridge spans the Malutang Reservoir, described as a “高原翡翠” (plateau emerald) and critical water resource. Liu Xin (刘昕), Project Chief Engineer, told Changjiang Daily that the team implemented graded excavation to ensure construction safety and soil conservation. A five-stage sedimentation tank system treats wastewater, and all construction slurry is removed by dump trucks to prevent water pollution.

The project team committed to “not a single stone dropped, not a single drop of wastewater leaked” during construction.

Strategic Significance

The Tianma Expressway runs approximately 52.8 kilometers from the Tianbao Port border gate to Malipo County, with a bridge-tunnel ratio of 80.4%. Designed as a two-way, four-lane expressway with an 80 km/h speed limit, it is expected to reach traffic-ready condition by October 2026.

Once operational, travel time from Wenshan to Tianbao Port will drop from approximately 120 minutes to about 70 minutes, while the journey from Malipo to Tianbao Port will be cut from 50 minutes to 30 minutes. The expressway will serve nearly 100,000 residents along the route.

Tianbao Port is one of the major land border crossings between China’s Yunnan Province and Vietnam’s Ha Giang Province. It serves as a key node in China’s Belt and Road Initiative (BRI) and is part of the economic corridor connecting Kunming to Hanoi and Haiphong.

Broader Border Infrastructure Context

This bridge completion is part of a broader wave of cross-border infrastructure development between China and Vietnam. The Bat Xat–Ba Sai border bridge over the Red River in Lao Cai Province — a 420-meter, six-lane cable-stayed bridge — is expected to complete its main span closure by August 30, 2026, as reported by VnEconomy. Vietnam and China broke ground on that bridge in March 2025, according to VOV Vietnam.

Vietnam has also proposed a $2 billion Bao Ha–Lai Chau expressway linking the Hanoi corridor to the China border at the Ma Lu Thang international border gate.

Economic and Regional Impact

The Tianma Expressway is expected to drive a transition from “通道经济” (corridor economy) to “口岸经济” (port economy), boosting border trade, tourism, and resource development in the Malipo and Wenshan regions. Improved port clearance efficiency will strengthen economic integration between China and Vietnam, reducing logistics costs and enhancing customs processing capacity.

What’s Next

The Malutang Bridge now enters its deck construction phase, with delivery expected by September 2026. The full expressway is projected to be traffic-ready by October 2026. Key questions remain about how Vietnam will connect its road network to Tianbao Port on its side in Ha Giang Province, and what the projected increases in bilateral trade volume through the port will be following the expressway’s opening.