Versions of Iowa Code 274.3 - Exercise of powers -- construction on LawServer 2024 Iowa Code 274.3 – Exercise of powers — construction 2023 Iowa Code 274.3 – Exercise of powers — construction 2022 Iowa Code 274.3 – Exercise of powers — construction. 2020 Iowa Code 274.3 – Exercise of powers — construction. 2018 Iowa Code 274.3 – Exercise of powers — construction.