# Montana SB 365: Revise siltation structure capacity at mines

Montana SB 365, Revise siltation structure capacity at mines, is a 69th Legislature, Regular Session (2025) Senate bill sponsored by Barry Usher (Republican); status signed, last action 2025-04-18 (Chapter Number Assigned) (as of 2026-10-12).

- Canonical: https://policyrisk.com/state-bill/MT-SB365-2025
- As of: 2026-10-12
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Bill: Montana SB 365
- State: Montana
- Session: 69th Legislature, Regular Session (2025)
- Title: Revise siltation structure capacity at mines
- Status: signed
- Chamber: Senate
- Introduced: 2025-02-19
- Last action: 2025-04-18, Chapter Number Assigned
- Sponsor: Barry Usher (Republican)
- Cosponsors: 1
- Subjects: Mining and Minerals, Water, Rule Making
- Touches household money: no
- Roll calls: 4 (294 yes, 5 no in all)
- Economic provisions PRIA read: 2

## Summary

No summary available.

## Bill overview: provisions PRIA read

- Mine operators must meet silt pond capacity: mixed, low. Mine operators must build each siltation pond to the design capacity set in state rule and the approved reclamation plan. A qualified registered engineer must certify the structure. If a series of storms exceeds that capacity, operations remain compliant if the operator restores capacity as soon as…
- Mining law in effect now; federal check: mixed, low. The law takes effect upon passage and approval. If the U.S. Secretary of the Interior disapproves any part under 30 CFR 732, that part is void. The Department of Environmental Quality must notify the code commissioner within 15 days after the federal disapproval takes effect.

## Sponsors and cosponsors

- Sponsor: Barry Usher (Republican), Senate
- Cosponsor: Jedediah Hinkle (Republican), House

## Roll call votes

| Date | Chamber | Motion | Result | Yes | No | Other |
| --- | --- | --- | --- | --- | --- | --- |
| 2025-03-31 | House | Do Concur | pass | 99 | 0 |   |
| 2025-03-29 | House | Do Concur | pass | 100 | 0 |   |
| 2025-03-06 | Senate | Do Pass | pass | 47 | 3 |   |
| 2025-03-05 | Senate | Do Pass | pass | 48 | 2 |   |

## Actions (23)

- 2025-04-18: Chapter Number Assigned (Senate)
- 2025-04-17: Signed by Governor (Senate)
- 2025-04-08: Transmitted to Governor (Senate)
- 2025-04-08: Signed by Speaker (House)
- 2025-04-07: Signed by President (Senate)
- 2025-04-02: Returned from Enrolling (Senate)
- 2025-03-31: Sent to Enrolling (Senate)
- 2025-03-31: 3rd Reading (House)
- 2025-03-29: 2nd Reading (House)
- 2025-03-24: Committee Report (House)
- 2025-03-21: Committee Executive Action (House)
- 2025-03-19: Hearing (House)
- 2025-03-17: 1st Reading (House)
- 2025-03-07: Referred to Committee (House)
- 2025-03-06: Transmitted to House (Senate)
- 2025-03-06: 3rd Reading (Senate)
- 2025-03-05: 2nd Reading (Senate)
- 2025-03-01: Committee Report (Senate)
- 2025-02-28: Committee Executive Action (Senate)
- 2025-02-21: Hearing (Senate)
- 2025-02-21: Referred to Committee (Senate)
- 2025-02-19: 1st Reading (Senate)
- 2025-02-19: Introduced (Senate)

## Bill text

- Enrolled, 2025-04-01: [PDF](https://docs.legmt.gov/download-ticket?ticketId=63e8da01-13de-409b-aabf-3871c2fb1498)
- As Amended (Version 2), 2025-03-01: [PDF](https://docs.legmt.gov/download-ticket?ticketId=d8fce936-f6e7-4d1d-9e8e-11ebffb73ad1)
- Introduced, 2025-02-19: [PDF](https://docs.legmt.gov/download-ticket?ticketId=25b74582-792e-4a7d-b723-2f98a1fd747e)

## Related bills

- SB 437: Revise definition of sex in Montana law (signed)
- HB 831: Increase elderly homeowner and renter income tax credit (vetoed)
- HB 628: Revise early literacy targeted intervention laws (vetoed)
- SB 410: Provide for Montana genomic security act (vetoed)
- SB 424: Revising the disabled veteran property tax assistance program (vetoed)
- SB 422: Generally revise laws relating to insurance coverage relating to cancer (vetoed)

## Sources
- [Enrolled (PDF)](https://docs.legmt.gov/download-ticket?ticketId=63e8da01-13de-409b-aabf-3871c2fb1498)
- [As Amended (Version 2) (PDF)](https://docs.legmt.gov/download-ticket?ticketId=d8fce936-f6e7-4d1d-9e8e-11ebffb73ad1)
- [Introduced (PDF)](https://docs.legmt.gov/download-ticket?ticketId=25b74582-792e-4a7d-b723-2f98a1fd747e)

## Related
- [SB 437: Revise definition of sex in Montana law](https://policyrisk.com/state-bill/MT-SB437-2025)
- [HB 831: Increase elderly homeowner and renter income tax credit](https://policyrisk.com/state-bill/MT-HB831-2025)
- [HB 628: Revise early literacy targeted intervention laws](https://policyrisk.com/state-bill/MT-HB628-2025)
- [SB 410: Provide for Montana genomic security act](https://policyrisk.com/state-bill/MT-SB410-2025)
- [SB 424: Revising the disabled veteran property tax assistance program](https://policyrisk.com/state-bill/MT-SB424-2025)
- [SB 422: Generally revise laws relating to insurance coverage relating to cancer](https://policyrisk.com/state-bill/MT-SB422-2025)
- [Montana bills](https://policyrisk.com/states/montana/bills)
- [Montana state hub](https://policyrisk.com/states/montana)
- [All state legislation](https://policyrisk.com/state-bills)

Source: PRIA, https://policyrisk.com/state-bill/MT-SB365-2025 (as of 2026-10-12).