FREDERICKSBURG, Texas (AP) — One of the longest proposed new natural gas pipelines in the U.S. is set to run through Heath Frantzen's property in the Texas Hill Country, where more than 600 white-tailed and trophy axis deer graze on a hunting ranch his family has owned for three generations.

Fearing financial ruin and conservation risks, Frantzen and dozens of other landowners in central Texas have banded together with environmental groups and conservative-leaning city governments in opposing the route of pipeline giant Kinder Morgan's 430-mile (690-kilometer), $2 billion natural gas expresswa...