---
type: "Bill"
title: "PROP TX-OPEN SPACE VALUATION"
description: "Amends the Property Tax Code. Provides that if land is improved with a water-retention dam that is operated primarily for commercial purposes, that dam is not considered to be used for open space purposes despite the fact that any resulting man-made lake may be considered to be used for open space purposes."
jurisdiction: "us/states/il"
legislature: "Illinois General Assembly"
session: "95th"
identifier: "HB 586"
citation: "Illinois HB 586 (95th)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: []
version_count: 3
action_count: 28
vote_count: 2
first_action: "2007-02-02"
last_action: "2007-08-13"
source: "openstates"
source_identifier: "ocd-bill/32a82040-df3d-4088-bcc4-28e857138475"
source_url: "http://ilga.gov/legislation/BillStatus.asp?DocNum=586&GAID=9&DocTypeID=HB&LegId=27655&SessionID=51&GA=95"
source_hash: "dc70fe6495a3ea674031c5eb9ce28fca21a1fd4715bcda4efa2369b2080918b3"
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-il"]
---

# Illinois HB 586 (95th) — PROP TX-OPEN SPACE VALUATION

Amends the Property Tax Code. Provides that if land is improved with a water-retention dam that is operated primarily for commercial purposes, that dam is not considered to be used for open space purposes despite the fact that any resulting man-made lake may be considered to be used for open space purposes.

## Version chain

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

1. **Introduced** (filed) — [source](http://ilga.gov/legislation/fulltext.asp?DocName=09500HB0586&GA=95&SessionId=51&DocTypeId=HB&LegID=27655&DocNum=586&GAID=9&Session=&print=true)
2. **Engrossed** (committee substitute) — [source](http://ilga.gov/legislation/fulltext.asp?DocName=09500HB0586eng&GA=95&SessionId=51&DocTypeId=HB&LegID=27655&DocNum=586&GAID=9&Session=&print=true)
3. **Enrolled** (enrolled) — [source](http://ilga.gov/legislation/fulltext.asp?DocName=09500HB0586enr&GA=95&SessionId=51&DocTypeId=HB&LegID=27655&DocNum=586&GAID=9&Session=&print=true)

## Votes

- Third Reading — **116–0** (pass) · lower
- Third Reading — **58–0** (pass) · upper

## Sponsors

- William B. Black — primary (person)

## Timeline

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

- **2007-02-02** Filed with the Clerk by Rep. William B. Black `filing`
- **2007-02-05** First Reading `reading-1`
- **2007-02-05** Referred to Rules Committee `referral-committee`
- **2007-02-07** Assigned to Revenue Committee `referral-committee`
- **2007-03-02** Recommends Do Pass Subcommittee/ Revenue Committee; 002-000-000 `committee-passage`
- **2007-03-02** Remains in Revenue Committee
- **2007-03-23** Committee Deadline Extended-Rule 9(b) March 31, 2007
- **2007-03-29** Do Pass / Short Debate Revenue Committee; 011-000-000 `committee-passage`
- **2007-03-29** Placed on Calendar 2nd Reading - Short Debate
- **2007-04-17** Second Reading - Short Debate `reading-2`
- **2007-04-17** Placed on Calendar Order of 3rd Reading - Short Debate
- **2007-04-18** Third Reading - Short Debate - Passed 116-000-000 `reading-3, passage`
- **2007-04-20** Arrive in Senate `introduction`
- **2007-04-20** Placed on Calendar Order of First Reading April 24, 2007 `reading-1`
- **2007-04-30** Chief Senate Sponsor Sen. Michael W. Frerichs
- **2007-05-01** First Reading `reading-1`
- **2007-05-01** Referred to Rules `referral-committee`
- **2007-05-02** Assigned to Revenue `referral-committee`
- **2007-05-10** Do Pass Revenue; 008-000-000 `committee-passage`
- **2007-05-10** Placed on Calendar Order of 2nd Reading May 15, 2007
- **2007-05-15** Second Reading `reading-2`
- **2007-05-15** Placed on Calendar Order of 3rd Reading May 16, 2007
- **2007-05-16** Third Reading - Passed; 058-000-000 `reading-3, passage`
- **2007-05-16** Passed Both Houses
- **2007-06-14** Sent to the Governor `executive-receipt`
- **2007-08-13** Governor Approved `executive-signature`
- **2007-08-13** Effective Date January 1, 2008
- **2007-08-13** Public Act . . . . . . . . . 95-0070 `became-law`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/32a82040-df3d-4088-bcc4-28e857138475`. Confidence: reported (aggregated from official Illinois legislature records).