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The flight of thirty locks from Stoke Pound to Tardebigge (Birmingham Level) raises the water level by 217 feet (66 metres) in about two miles (3.3 km). These locks are numbered 29 to 58, bottom to top, all of them Grade II listed structures.

In all, between the River Severn at Worcester and the Birmingham level (just under sixteen miles) there are 58 locks, raising the water level by 428 feet (about 157 metres) and five tunnels. This was not the original plan, which involved 76 locks. At one time the engineer John Woodhouse proposed that there be just twelve locks and a series of boat-lifts, but although just one lift was built (at the present Tardebigge Top Lock) this was quite quickly replaced, and the lift idea was replaced with just 58 locks.

Wikipedia has more details: Link

The Worcester and Birmingham Canal was built in stages between 1791 and 1815 to connect the River Severn in Worcester to the Birmingham Canal System using a quicker route than the earlier Staffordshire and Worcestershire Canal. Opposition from other canal companies meant that for twenty years there was no direct connection in Birmingham, the last two and a bit metres of canal there being left uncompleted in 1795. Link

This lunacy was eventually resolved by an Act of Parliament in 1815 and a stop-lock constructed.

Grain, timber and agricultural produce were carried to the Midlands. Industrial goods and coal were carried down towards Worcester, often for onward transport to Bristol. Later, salt carrying was added as a regular cargo. Pairs of donkeys were often used in preference to horses, maybe because they could easily be put onto the boats which had to be legged (or pulled by tug) through the tunnels.

The canal has five tunnels. The longest at Kings Norton is just under two miles long. Steam tugs were used from the 1870s to haul strings of narrowboats through Wasts Hill, Shortwood and Tardebigge tunnels. The Worcester and Birmingham Canal has locks, 58 of them, climbing 428 feet (130 metres) from the level of the River Severn in Worcester up to Birmingham.

In the twenty-first century the ring now formed by the two canals and the river makes a popular two weeks holiday route, albeit partly a strenuous one, lockwise, but there are plenty of pubs, though some are now merely restaurants with a bar. The Worcester and Birmingham Canal travels through some very pleasant countryside, climbing from the Severn through rolling fields and wooded cuttings and slicing through a hilly ridge south of Birmingham.

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