In the case of Weiland, State Engineer of the State of Colorado, et al. v. Pioneer Irrigation Company in 1921, the Supreme Court was tasked with determining whether or not a state could regulate water use within its borders without violating federal law. The dispute arose when Colorado attempted to limit Pioneer Irrigation Company's usage due to concerns about overuse and depletion. The company argued that this violated their rights under an 1866 mining law which granted them unrestricted access to water for irrigation purposes on their land holdings acquired through said law. The court ruled in favor of Colorado, stating that while the 1866 mining act did grant certain rights regarding water usage for irrigation purposes on lands obtained under it, these rights were not absolute and could be regulated by states as necessary to prevent misuse and ensure fair distribution among all users. This decision affirmed states' authority over natural resources within their boundaries and set a precedent allowing them greater control over resource management.

The dissenting opinion in the case of Weiland, State Engineer of the State of Colorado, et al. v. Pioneer Irrigation Company argued that the majority's decision was a departure from established principles regarding water rights and interstate compacts. The dissent contended that under these principles, Colorado had no right to divert water from an interstate stream for use within its borders if such diversion would harm users downstream in another state who were relying on this water source based on prior appropriation rights. They believed that by allowing Colorado to do so without any compensation or agreement with those affected downstream was not only unfair but also violated constitutional protections against taking private property for public use without just compensation.