Iowa Code
Chapter 1 - SOVEREIGNTY AND JURISDICTION OF THE STATE
Section 1.3 - Concurrent jurisdiction.

1.3 Concurrent jurisdiction.
The state has concurrent jurisdiction on the waters of any river or lake which forms a common boundary between this and any other state.
[C51, §3; R60, §3; C73, §3; C97, §3; C24, 27, 31, 35, 39, §3; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, 79, 81, §1.3]
See Act of Congress, Sess. II, Chapter 48, 5 Stat. 742 (1845); Act of Congress, Sess. I, Chapter 82, 9 Stat. 52 (1846); Act of Congress, Sess. II, Chapter 1, 9 Stat. 117 (1846)