It’s not a matter of if a privately built border fence along the shores of the Rio Grande will fail, it’s a matter of when, according to a new engineering report on the troubled project.

The report is one of two new studies set to be filed in federal court this week that found numerous deficiencies in the 3-mile border fence, built this year by North Dakota-based Fisher Sand and Gravel. The reports confirm earlier reporting from ProPublica and The Texas Tribune, which found that segments of the structure were in danger of overturning due to extensive erosion if not fixed and properly maintained. Fisher dismissed the concerns as normal post-construction issues.

Donations that paid for part of the border fence are at the heart of an indictment against members of the We Build the Wall nonprofit, which raised more than $25 million to help President Donald Trump build a border wall.