---
type: "Bill"
title: "Projects To Restore Natural Stream Systems"
description: "The act states that the following projects within a natural stream system for certain restoration purposes (stream restoration project) do not cause material injury to a vested water right and are not an unnecessary dam or other obstruction:"
jurisdiction: "us/states/co"
legislature: "Colorado General Assembly"
session: "2023A"
identifier: "SB 23-270"
citation: "Colorado SB 23-270 (2023A)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["Cleave Simpson", "Dylan Roberts", "Karen McCormick", "Marc Catlin"]
version_count: 9
action_count: 14
vote_count: 2
first_action: "2023-04-05T06:00:00+00:00"
last_action: "2023-06-05T06:00:00+00:00"
source: "openstates"
source_identifier: "ocd-bill/6f72def1-3056-4969-b79d-2b9c92244b87"
source_url: "https://leg.colorado.gov/bills/sb23-270"
source_hash: "1a401fbf9b44d431af9dd9d58fc33da88db4475b7fad0114d409358b9a828673"
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-co"]
---

# Colorado SB 23-270 (2023A) — Projects To Restore Natural Stream Systems

The act states that the following projects within a natural stream system for certain restoration purposes (stream restoration project) do not cause material injury to a vested water right and are not an unnecessary dam or other obstruction:

## Version chain

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

1. **Committee Amendment** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/2023a_sb270_h_awn_001.pdf)
2. **Engrossed (04/17/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_270_eng.pdf)
3. **Final Act (05/15/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_270_enr.pdf)
4. **Introduced (04/05/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_270_01.pdf)
5. **PA1 (04/14/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_270_s_agr_01.pdf)
6. **Reengrossed (04/18/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_270_ren.pdf)
7. **Rerevised (05/06/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_270_rer.pdf)
8. **Revised (05/03/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2023A/bills/2023a_270_rev.pdf)
9. **Signed Act (06/05/2023)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/2023a_270_signed.pdf)

## Votes

- BILL — **35–0** (pass) · upper
- BILL — **65–0** (pass) · lower

## Sponsors

- Cleave Simpson — primary (person)
- Dylan Roberts — primary (person)
- Karen McCormick — primary (person)
- Marc Catlin — primary (person)

## Timeline

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

- **2023-06-05T06:00:00+00:00** Governor Signed `executive-signature`
- **2023-05-15T06:00:00+00:00** Sent to the Governor `executive-receipt`
- **2023-05-15T06:00:00+00:00** Signed by the Speaker of the House
- **2023-05-15T06:00:00+00:00** Signed by the President of the Senate
- **2023-05-06T06:00:00+00:00** House Third Reading Passed - No Amendments `passage, reading-3`
- **2023-05-04T06:00:00+00:00** House Third Reading Laid Over Daily - No Amendments
- **2023-05-03T06:00:00+00:00** House Second Reading Special Order - Passed - No Amendments
- **2023-04-27T06:00:00+00:00** House Second Reading Laid Over Daily - No Amendments
- **2023-04-24T06:00:00+00:00** House Committee on Agriculture, Water & Natural Resources Refer Unamended to House Committee of the Whole `committee-passage, referral-committee`
- **2023-04-18T06:00:00+00:00** Introduced In House - Assigned to Agriculture, Water & Natural Resources `introduction`
- **2023-04-18T06:00:00+00:00** Senate Third Reading Passed - No Amendments `passage, reading-3`
- **2023-04-17T06:00:00+00:00** Senate Second Reading Special Order - Passed with Amendments - Committee
- **2023-04-13T06:00:00+00:00** Senate Committee on Agriculture & Natural Resources Refer Amended to Senate Committee of the Whole `committee-passage, referral-committee`
- **2023-04-05T06:00:00+00:00** Introduced In Senate - Assigned to Agriculture & Natural Resources `introduction`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/6f72def1-3056-4969-b79d-2b9c92244b87`. Confidence: reported (aggregated from official Colorado legislature records).