Laxiwa Dam: Harnessing the Yellow River's Upper Reaches

**Laxiwa Dam** is the tallest dam on the Yellow River and one of the highest arch dams in the world, standing **250 meters** above its foundation in a remote canyon in Guide County, Qinghai Province, China. With an installed capacity of **4,200 MW**, it is the most powerful hydroelectric station on China's second-longest river.

Introduction

Completed in 2010, Laxiwa Dam exploits the steep gradient of the Yellow River's upper reaches as the river descends from the Tibetan Plateau through the arid canyons of Qinghai. The dam sits at an elevation of approximately 2,400 meters above sea level, in a landscape of barren rock and sparse vegetation strikingly different from the fertile plains the Yellow River crosses further downstream.

Engineering & Structure

• Type: Double-curvature arch dam
• Height: 250 meters
• Crest Length: 460 meters
• Concrete Volume: 2.6 million m³

Laxiwa's double-curvature arch design is particularly well-suited to the narrow canyon at the dam site, where the valley floor is only about 70 meters wide. The arch transfers the enormous water pressure into the granite canyon walls, requiring only 2.6 million cubic meters of concrete — far less than a gravity dam of comparable height would need. The dam's crest stretches 460 meters, with a maximum base thickness of about 49 meters.

The power station houses six 700 MW Francis turbines in an underground cavern on the left bank. The high head of approximately 200 meters provides excellent hydraulic efficiency. Construction at high altitude in an arid climate posed unique challenges, including extreme temperature swings that required careful concrete curing management.

Geographic Setting

• River: Yellow River (Huang He)
• Location: Guide County, Qinghai Province, China
• Coordinates: 36.05°N, 100.85°E
• Elevation: ~2,400 m above sea level

The Yellow River at Laxiwa flows through a dramatic arid canyon carved into Precambrian basement rock. The surrounding landscape is a high-altitude semi-desert with minimal vegetation, stark rocky ridges, and clear skies. The dam is situated in the transition zone between the Tibetan Plateau and the Loess Plateau, one of the most geologically dynamic regions in China.

The reservoir extends approximately 45 kilometers upstream through the narrow canyon. Because the valley is so confined, the reservoir's surface area is relatively small — about 39 square kilometers — despite its enormous depth. This minimizes evaporation losses, an important advantage in the water-scarce upper Yellow River basin.

Hydroelectric Power

• Installed Capacity: 4,200 MW
• Annual Output: ~10.2 TWh
• Turbines: 6 × 700 MW Francis turbines

Laxiwa's 4,200 MW installed capacity makes it the most powerful station on the Yellow River, which has a total cascade of over 25 dams along its main stem and major tributaries. The six 700 MW turbines generate approximately 10.2 terawatt-hours per year, supplying electricity to Qinghai Province's growing industrial sector and to the national grid via high-voltage interconnections.

The upper Yellow River's flow is relatively clean compared to the sediment-laden lower reaches, which reduces turbine wear and maintenance costs. However, the seasonal flow variation is significant, with summer monsoon flows several times greater than winter flows, requiring careful reservoir management to balance power generation, flood control, and water supply.

Environmental & Social Impact

• People Relocated: ~3,200
• Water Scarcity: Yellow River is severely over-allocated
• Ecological Concern: Disruption to Yellow River fish species

Because of the sparse population in the upper Yellow River canyon, only about 3,200 people required relocation — mostly Tibetan and Hui ethnic minority herders and farmers. The relatively small social footprint stands in contrast to the dam's enormous physical scale, reflecting the remoteness of the Qinghai plateau.

The Yellow River is one of the most over-allocated rivers on Earth, and every dam on its course intensifies competition for water between irrigation, industry, urban supply, and ecological needs. The river infamously ran completely dry at its mouth in the 1990s before government regulations enforced minimum flows. Laxiwa's reservoir management must balance power generation with downstream water delivery obligations.

Key Facts

• Laxiwa Dam is the tallest dam on the Yellow River at 250 meters.
• Its 4,200 MW installed capacity is the largest of any Yellow River station.
• The dam sits at approximately 2,400 meters above sea level in an arid canyon.
• The narrow canyon required only 2.6 million m³ of concrete for the arch design.
• Annual generation averages 10.2 TWh from six 700 MW turbines.

Fun Facts

• The Yellow River's name comes from the massive quantities of loess sediment it carries — but at Laxiwa, far upstream of the Loess Plateau, the water runs surprisingly clear.
• The canyon at Laxiwa is so narrow at the base that the dam wall spans barely 70 meters at its foundation.
• Qinghai Province, where Laxiwa sits, is larger than France but has a population of only about 6 million people.

Final Thoughts

Laxiwa Dam is a remarkable feat of high-altitude engineering, harnessing the Yellow River's descent from the Tibetan Plateau in one of the most remote and arid landscapes where major dams have been built. Its towering arch and powerful turbines make it the flagship hydroelectric facility on China's "Mother River."