HB 4470 Michigan House · 2025-2026 Regular Session

Highways: bridges; Mackinac Bridge; designate as a key facility. Amends sec. 552c of 1931 PA 328 (MCL 750.552c).

HB 4470 amends Michigan's penal code to designate specific portions of the Mackinac Bridge (those not open to or intended for public use) as a "key facility" under existing law. This means unauthorized entry onto these bridge sections - when enclosed by barriers like water and properly posted with signage - would become a felony punishable by up to 4 years in prison or a $2,500 fine. The bill adds the Mackinac Bridge to a list of protected critical infrastructure, including power plants, water facilities, and chemical plants, all requiring physical barriers and visible signage to enforce entry restrictions. It does not change current penalties or posting requirements but extends them specifically to the Mackinac Bridge's restricted areas.

Bill status passed both 4 of 5 stages cleared

Introduction

May 2025

Committee Review

Dec 2025

House Passage

Dec 2025

Senate Passage

Dec 2025

Governor

Introduced May 7, 2025 Last action Dec 10, 2025

Maddy AI version diff · 1 comparison

What changed between versions

House Introduced Bill → As Passed by the House · 5 edits · Dec 9, 2025

MODERATE

The bill was amended to add new categories of facilities protected under Michigan's key facility trespass law, including natural gas utility facilities, fuel terminals, and hazardous waste facilities. The amendment also renumbered existing subsections and corrected grammatical errors in the text. These changes expand the scope of facilities where unauthorized entry is now a felony.

Scope change

The bill's scope was expanded to include natural gas utility facilities, fuel terminal or storage facilities, and hazardous waste storage, treatment, or disposal facilities as protected key facilities.

SCOPE

Added natural gas utility facilities (including age stations, compressor stations, odorization facilities, main line valves, natural gas storage facilities) to the list of protected key facilities.

Added fuel terminal or storage facilities (gasoline, propane, liquid natural gas, or other fuel) to the list of protected key facilities.

Added hazardous waste storage, treatment, or disposal facilities to the list of protected key facilities.

DEFINITION

Renumbered subsections from (3) through (6) to (2) through (5) to accommodate the new facility categories, which were inserted between subsections (d) and (e).

TECHNICAL

Corrected grammatical errors and formatting inconsistencies in the text, including removing duplicate words like 'shall must' and 'person An individual'.

Floor votes · House Dec 9, 2025

How they voted

This bill passed the Senate by voice vote (no roll call recorded).

Full legislative history

Actions timeline

Total actions

Key actions

Committee

Dec 10, 2025

Committee

REFERRED TO COMMITTEE ON TRANSPORTATION AND INFRASTRUCTURE

upper

Dec 10, 2025

Upper · Passed

PASSED BY HOUSE WITH IMMEDIATE EFFECT

upper

Dec 9, 2025

Lower · Passed

passed; given immediate effect Roll Call #318 Yeas 92 Nays 8 Excused 0 Not Voting 10

lower

Oct 28, 2025

Committee

referred to second reading

lower

Oct 28, 2025

Lower · Passed

reported with recommendation without amendment

lower

May 7, 2025

Committee

referred to Committee on Transportation and Infrastructure

lower

May 7, 2025

Introduced

introduced by Representative Rep. Dave Prestin

lower

1 primary · 16 co-sponsors