Question: What is the common length (in yards) of a pool used for competitive swimming in the USA?
About the article "Human swimming", section "Sport".

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In Swimming, the term Short Course (abbreviated SC) is used to identify a pool that is 25 metres (or 25 yards) in length.
The term is also often included in meet names when conducted in a short course pool.
"Short course" is the second type of pool configuration currently recognized by FINA and other swimming bodies for pool competition; the other/primary pool length being "long course", where the pool is 50 metres in length.
Olympic and the World Championships are conducted in a long course pool.
In the United States, the term "short course" is more commonly applied to competition, which is more common in that country.
Short course yards is generally abbreviated as "SCY" to differentiate it from short course metres (SCM).
The US national federations, USA Swimming and United States Masters Swimming, both maintain SCY USA records, FINA does not currently recognize records set in SCY, as well as SCM records.
USA college (including NCAA competition) and high school swimming are traditionally swum SCY.
Short course meter competitions are also denoted by listing of the actual metre distance: "25m" (note: within swimming, a space is not placed between the number and the meter "m").
Short course records are traditionally faster than those set on long course, as push off the wall gives extra speed. 
Swimming as a sport predominantly involves competition among participants to be the fastest over a given distance under self propulsion.
Different distances are swum in different levels of competition.
For example, swimming has been part of Olympic Swimming since 1896, and the current program contains events from 50m to 1500m in length, across all four main strokes and medley.
The sport is governed internationally by the Fédération Internationale de Natation (FINA), and competition pools for FINA events are 25 or 50 metres in length.
In the United States of America, USA Swimming is the governing body and a pool 25 yards in length is commonly used for competition.
There are other swimming and water related sporting disciplines including diving, synchronised swimming and water polo, as well as sports which include a swimming element, such as triathlon and modern pentathlon.
The Pan Am Pool is an indoor swimming facility in Winnipeg, Manitoba, Canada built for the 1967 Pan American Games.
It is located in southwest Winnipeg and consists of three pools, two of them used for competitive swimming, and one is a children's "kiddie pool". 
A swimming pool, swimming bath, wading pool, paddling pool, or simply a pool, is a container filled with water intended for swimming or water-based recreation.
There are many standard sizes, the largest of which is the Olympic-size swimming pool.
A pool can be built either above or in the ground, and from materials such as concrete (also known as gunite), metal, plastic or fiberglass.
Pools that may be used by many people or by the general public are called public, while pools used exclusively by a few people or in a home are called private.
Many health clubs such as the YMCA, fitness centers and private clubs have public pools used mostly for exercise.
Many hotels have pools available for their guests.
Educational facilities such as schools and universities occasionally have pools for swimming or physical education classes, or competitive athletics such as swim team.
Hot tubs and spas are pools with hot water, used for relaxation or therapy, and are common in homes, hotels, clubs and massage parlors.
Swimming pools are also used for diving and other water sports, as well as for the training of lifeguards and astronauts. 
 "See: #Competition pools (below)" Dimensions.
Length:Most pools in the world are measured in metres, but in the United States pools are often measured in feet and yards.
In the United Kingdom most pools are in metres, but older pools measured in yards still exist.
In the US, pools tend to either be 25 yards (SCY-short course yards), 25 metres (SCM-short course metres) or 50 metres (long course).
US high schools and the NCAA conduct short course (25 yards) competition.
There also exist many pools 33⅓ m long, so that 3 lengths = 100 m. This pool dimension is commonly used to accommodate water polo.USA Swimming (USA-S) swims in both metric and non-metric pools.
However, the international standard is metres, and world records are only recognized when swum in 50 m pools (or 25 m for short course).
In general, the shorter the pool, the faster the time for the same distance, since the swimmer gains speed from pushing off the wall after each turn at the end of the pool.
Width:Most European pools are between 10 m and 50 m wide.
Depth:The depth of a swimming pool depends on the purpose of the pool, and whether it is open to the public or strictly for private use.
If it is a private casual, relaxing pool, it may go from deep.
If it is a public pool designed for diving, it may slope from in the deep end.
A children's play pool may be from deep.
Most public pools have differing depths to accommodate different swimmer requirements.
In many jurisdictions, it is a requirement to show the water depth with clearly marked depths affixed to the pool walls.