CHICAGO, July 12 (Reuters) - U.S. soybean supplies were unexpectedly forecast to rise from last year on Wednesday as the government cut its outlook for exports and left yield prospects unchanged despite a dry spring.

Ending stocks of soybeans for the 2023/24 marketing year were pegged at 300 million bushels, the U.S. Agriculture Department said in its monthly World Agricultural Supply and Demand Estimates report. That was above market forecasts for 199 million bushels and below the government's June outlook for 350 million bushels. (Reporting by Mark Weinraub)