TransCanada is reaffirming plans to restart the Keystone oil pipeline from Alberta to the U.S. Midwest on Saturday, although rainy weather is hampering inspection efforts efforts.

TransCanada shut down the 3,380-kilometre pipeline Wednesday after tests showed possible safety issues.

A company spokesman said Friday that no leaks have been found but declined to provide more specifics until the pipeline is inspected.

The pipeline carries about 590,000 barrels of crude per day from Canada to facilities in the Midwest.

A "small anomaly" was detected in a section of the line between Missouri and Illinois.

Crude supplies are plentiful across the U.S. and industry observers say the temporary closure isn't expected to affect refinery production or retail gasoline prices.