Construction firms added jobs in 40 states, as well as the District of Columbia, from April 2014 to last year. Thirty states and D.C. saw an increase from March to April, according to analysis of Labor Department data by the Associated General Contractors of America.

“The latest data show that construction is growing across most of the country but the gains remain uneven by month and state,” says Ken Simonson, the association’s chief economist. “Construction employment grew faster than overall employment in most states in the latest 12 months, but the industry faces two challenges: a lack of experienced workers in many locations and a risk that funding for highway and transit projects will lapse in the next few months.”

California added more new construction jobs (42,600 jobs, 6.4 percent) year-to-year, while Idaho (12.4 percent, 4,400 jobs) added the highest percentage of new construction jobs. West Virginia (-4,400 jobs, -13.1 percent) lost the highest total and percent of construction jobs.

Pennsylvania (10,000 jobs, 4.3 percent) added the most jobs between March and April, and Minnesota (6,600 jobs, 6.3 percent) had the highest percentage increase for the month.

Eighteen states lost construction jobs during the past month, led by Texas (-5,400 jobs, -0.8 percent). West Virginia (-1,600 jobs, -5.2 percent) lost the highest percent of construction jobs.