---
type: "Bill"
title: "Allow environmental impact reviews beyond Montana's borders"
description: "Allow environmental impact reviews beyond Montana's borders"
jurisdiction: "us/states/mt"
legislature: "Montana Legislature"
session: "2023"
identifier: "HB 641"
citation: "Montana HB 641 (2023)"
classification: ["bill"]
subjects: ["Environmental Protection", "Federal Government"]
status: "enacted"
primary_sponsors: ["Katie Zolnikov"]
version_count: 2
action_count: 52
vote_count: 9
first_action: "2022-12-04T22:57:44+00:00"
last_action: "2023-05-22T20:47:44+00:00"
source: "openstates"
source_identifier: "ocd-bill/4e8f1e2c-b8aa-4cb7-a4de-0ed162465a3e"
source_url: "https://bills.legmt.gov/#/bill/20231/LC3043"
source_hash: "d3c857c3edea93aab678f7fdfc501410cff51f70b18ce08c797fa0b1b0e8fd3e"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-mt"]
---

# Montana HB 641 (2023) — Allow environmental impact reviews beyond Montana's borders

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **HB0641_1.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=9531)
2. **HB0641_X.pdf** (committee substitute) — [source](https://api.legmt.gov/docs/v1/documents/getContent?documentId=9532)

## Votes

- (H) 3rd Reading Passed — **97–1** (pass) · lower
- (H) 2nd Reading Passed — **100–0** (pass) · lower
- (S) 2nd Reading Concur Motion Failed — **21–29** (fail) · upper
- (H) Committee Executive Action--Bill Passed — **15–0** (pass) · lower
- (S) 2nd Reading Indefinitely Postponed — **30–20** (pass) · upper
- (S) 3rd Reading Concurred — **45–4** (pass) · upper
- (S) Reconsidered Previous Action; Remains in 2nd Reading Process — **33–15** (pass) · upper
- (S) Committee Executive Action--Bill Concurred — **11–0** (pass) · upper
- (S) 2nd Reading Concurred — **45–5** (pass) · upper

## Sponsors

- Katie Zolnikov — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2023-05-22T20:47:44+00:00** Chapter Number Assigned `became-law`
- **2023-05-19T20:26:34+00:00** (H) Signed by Governor `executive-signature`
- **2023-05-10T21:30:00+00:00** (H) Transmitted to Governor `executive-receipt`
- **2023-05-10T19:00:00+00:00** (S) Signed by President `passage`
- **2023-05-04T20:00:00+00:00** (H) Signed by Speaker `passage`
- **2023-04-06T20:44:37+00:00** (C) Printed - Enrolled Version Available `enrolled`
- **2023-04-06T20:44:36+00:00** (H) Returned from Enrolling
- **2023-04-04T23:04:53+00:00** (H) Sent to Enrolling
- **2023-04-04T21:32:02+00:00** (S) Returned to House
- **2023-04-03T17:04:00+00:00** (S) 3rd Reading Concurred `passage, reading-3`
- **2023-04-03T16:00:00+00:00** (S) Scheduled for 3rd Reading `reading-3`
- **2023-03-31T19:36:00+00:00** (S) 2nd Reading Concurred `reading-2, reading-2`
- **2023-03-31T19:00:00+00:00** (S) Scheduled for 2nd Reading `reading-2`
- **2023-03-30T20:55:00+00:00** (S) Reconsidered Previous Action; Remains in 2nd Reading Process `reading-2`
- **2023-03-30T19:41:00+00:00** (S) 2nd Reading Indefinitely Postponed `reading-2, reading-2`
- **2023-03-30T19:40:00+00:00** (S) 2nd Reading Concur Motion Failed `failure, reading-2, reading-2`
- **2023-03-28T19:10:00+00:00** (S) Committee Report--Bill Concurred
- **2023-03-27T21:00:00+00:00** (S) Committee Executive Action--Bill Concurred
- **2023-03-22T21:00:00+00:00** (S) Hearing
- **2023-03-13T23:06:10+00:00** (S) Referred to Committee `referral-committee`
- **2023-03-10T00:13:15+00:00** (S) First Reading `reading-1`
- **2023-03-03T21:34:56+00:00** (H) Transmitted to Senate
- **2023-03-03T17:00:00+00:00** (H) 3rd Reading Passed `passage, reading-3`
- **2023-03-03T16:00:00+00:00** (H) Scheduled for 3rd Reading `reading-3`
- **2023-03-02T17:13:00+00:00** (H) 2nd Reading Passed `reading-2, reading-2`
- **2023-03-02T15:00:00+00:00** (H) Scheduled for 2nd Reading `reading-2`
- **2023-02-28T20:48:00+00:00** (H) Committee Report--Bill Passed `committee-passage`
- **2023-02-28T15:32:07+00:00** (H) Fiscal Note Printed
- **2023-02-27T23:13:27+00:00** (H) Fiscal Note Signed
- **2023-02-27T17:53:41+00:00** (H) Fiscal Note Received `receipt`
- **2023-02-20T23:41:00+00:00** (H) Committee Executive Action--Bill Passed `committee-passage`
- **2023-02-20T22:00:16+00:00** (H) Hearing
- **2023-02-17T20:20:54+00:00** (H) First Reading `reading-1`
- **2023-02-17T17:47:53+00:00** (C) Introduced Bill Text Available Electronically
- **2023-02-17T17:01:27+00:00** (H) Referred to Committee `referral-committee`
- **2023-02-17T17:00:01+00:00** (H) Fiscal Note Requested
- **2023-02-17T16:58:56+00:00** (H) Introduced
- **2023-02-17T16:58:55+00:00** (C) Fiscal Note Probable
- **2023-02-17T15:04:26+00:00** (C) Draft Delivered to Requester
- **2023-02-17T00:26:03+00:00** (C) Draft Ready for Delivery
- **2023-02-17T00:18:28+00:00** (C) Executive Director Final Review
- **2023-02-17T00:18:23+00:00** (C) Draft Ready for Delivery
- **2023-02-17T00:16:28+00:00** (C) Draft in Assembly
- **2023-02-17T00:09:09+00:00** (C) Executive Director Review
- **2023-02-17T00:01:13+00:00** (C) Bill Draft Text Available Electronically
- **2023-02-17T00:01:12+00:00** (C) Draft in Final Drafter Review
- **2023-02-16T23:53:29+00:00** (C) Draft in Input/Proofing
- **2023-02-16T23:39:41+00:00** (C) Draft to Drafter - Edit Review
- **2023-02-16T23:26:18+00:00** (C) Draft in Edit
- **2023-02-16T22:51:43+00:00** (C) Draft in Legal Review
- **2023-02-16T18:46:30+00:00** (C) Draft to Requester for Review
- **2022-12-04T22:57:44+00:00** (C) Draft Request Received `receipt`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/4e8f1e2c-b8aa-4cb7-a4de-0ed162465a3e`. Confidence: reported (aggregated from official Montana legislature records).