This study analyzes the rockfall hazard at Portão do Inferno, located in Chapada dos Guimarães, Mato Grosso (MT), by applying a rockfall risk mapping methodology and its implications for infrastructure work and safety. The objective of the work was to identify areas susceptible to rockfalls and assess the associated risks, considering the local geology and the impacts on highway MT-251. The methodology included Unmanned Aerial Vehicle (UAV)-based aerial surveys, and application of criteria from the Brazilian Geological Service, along with data obtained from the Construction Inspection Report prepared in November 2024. The mapping considered the slope of the terrain to identify critical areas and define hazard zones. The main results indicate that the region has slopes exceeding 50 degrees and fracture systems S1 and S2, which present a high potential for landslides. The study identified unstable blocks that could be removed by highway management and suggested mitigation interventions, including continuous monitoring and the adoption of containment systems. Additionally, it highlighted the importance of vegetation in dissipating the energy of the falling blocks and in stabilizing the slopes. The study concludes that a detailed analysis of geological discontinuities, combined with a continuous monitoring and mitigation system, is essential to reduce risks and avoid high-cost emergency measures. It also reinforces the need to correlate rainfall events with rockfalls to improve prediction and intervention planning.