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Historical sections
As well as its present-day course, fourteen centuries of canal-building have left the Grand Canal with a number of historical sections. Some of these have disappeared, others are still partially extant, and others form the basis for the modern canal. The following are the most important, but are not an exhaustive list.

The Jia Canal
In 1604, to solve the problem of the Grand Canal having to use 100 miles of the perilous course of the Yellow River in Northern Jiangsu, a man named Li Hualong opened the Jia Canal. Named after the Jia River whose course it followed, it ran 90 miles from Xiazhen (modern Weishan) on the shore of Shandong's Weishan Lake to Suqian in Jiangsu. The construction of the Jia Canal left only 60 miles of Yellow River navigation on the Grand Canal, from Suqian to Huai'an, which by 1688 had been removed by the construction of the Middle Canal by Jin Fu.

The Nanyang New Canal
In 1566, to escape the problems caused by flooding of the Yellow River around Yutai (now on the western shore of Weishan Lake), the Nanyang New Canal was opened. It ran for 47 miles from Nanyang (now Nanyang Town in the centre of Weishan Lake) to the small settlement of Liucheng (in the vicinity of modern Gaolou Village, Weishan County, Shandong) north of Xuzhou City. This change in effect moved the Grand Canal from the low-lying and flood-prone land west of Weishan Lake onto the marginally higher land to its east. It was fed by rivers flowing east-west from the borders of the Shandong massif.

The Huitong Canal
North of the Jizhou Canal summit section, the Huitong Canal ran downhill, fed principally by the River Wen, to join the Wei River at the city of Linqing. In 1289, a geological survey preceeded its one-year construction. The Huitong Canal, built by an engineer called Ma Zhizhen, ran across sharply sloping ground, and the high concentration of locks gave it the nicknames chahe or zhahe, ie 'the river of locks'. Its great number of feeder springs (between two- and four-hundred, depending on the counting method and season of the year) also led to it being called the quanhe or 'river of springs'.

The Jizhou Canal
This, the grand canal's first true summit section, was engineered by the Mongol Oqruqči in 1238 to connect Jining to the southern end of the Huitong Canal. It rose to a height of 138' above the Yangtze, but environmental and technical factors left it with chronic water shortages until it was re-engineered in 1411 by Song Li of the Ming. Song Li's improvements, recommended by a local man named Bai Ying, included damming the rivers Wen and Guang and drawing lateral canals from them to feed reservoir lakes at the very summit, at a small town called Nanwang.

Duke Huan's Conduit
In 369 AD, General Huan Wen of the Eastern Jin dynasty connected the shallow river valleys of the Huai and the Yellow. He achieved this by joining two of these rivers' tributaries, the Si and the Ji respectively, at their closest point, across a low watershed of the Shandong massif. Huan Wen’s primitive summit canal became a model for the engineers of the Jizhou Canal.

The Yilou Canal
The Shanyang Canal originally opened onto the Yangtze a short distance south of Yangzhou. As the north shore of the Yangtze gradually silted up to create the sandbank island of Guazhou, it became necessary for boats crossing to and from the Jiangnan Canal to sail the long way around the eastern edge of that island. After a particularly rough crossing of the Yangtze from Zhenjiang, the local prefect realised that a canal dug directly across Guazhou would slash the journey time and so make the crossing safer. The Yilou Canal was opened in 738 AD and still exists, though not as part of the modern grand canal route.