DNR FLOOD EVENT CONSTRUCTION

Illinois General Assembly - Full Text of SB1595

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104TH GENERAL ASSEMBLY
State of Illinois
2025 and 2026
SB1595

Introduced 2/4/2025, by Sen. Jil Tracy

SYNOPSIS AS INTRODUCED:

615 ILCS 5/40 new

Amends the Rivers, Lakes, and Streams Act. Provides that, for
construction related to worst-case analysis flood events, the Department
of Natural Resources shall (1) for levee improvements, provide notice of
submissions, a detailed timeline, specific requirements, and any internal
review procedures to the submitter within 90 days; (2) for rural
construction along navigable waterways, permit a water surface profile
increase of 0.5 feet; (3) for urban construction, permit a water surface
profile increase of 0.1 feet; and (4) require a mitigation analysis only if
water surface profile increases exceed an induced head study. Effective
immediately.
LRB104 06575 LNS 16611 b

A BILL FOR

SB1595
LRB104 06575 LNS 16611 b
1

AN ACT concerning transportation.

2

Be it enacted by the People of the State of Illinois,
3
represented in the General Assembly:

4

Section 5.
The Rivers, Lakes, and Streams Act is amended
5
by adding Section 40 as follows:

6

(615 ILCS 5/40 new)
7

Sec. 40.
Department requirements.

8

(a) For the purposes of this Section:
9

"Base condition" means the current pre-permit top of levee
10
elevation profile, cross-sections, and levee centerline
11
alignment.

12

"Induced head" means:
13

(1) the change of the water surface profile; and
14

(2) any change in water elevations upstream or
15

downstream of the proposed improvement due to the change
16

of a base condition in levee height to a proposed
17

condition in levee height or encroachment.
18

"Proposed condition" means the change requested for State
19
and federal permits.

20

"Worst-case analysis" means flood events up to and
21
including 1% annual chance of exceedance (100-year frequency).

22

(b) Notwithstanding any other provision of law, the
23
Department shall require the following for construction

SB1595
- 2 -
LRB104 06575 LNS 16611 b
1
related to worst-case analysis flood events:
2

(1) with respect to the Department's permit process
3

for levee improvements, the Department shall provide
4

notice of submissions, a detailed timeline, specific
5

requirements, and any internal review procedures for
6

review to the submitter within 90 days;
7

(2) with respect to Department standards for
8

construction in rural areas along navigable waterways, the
9

Department shall permit a water surface profile increase
10

of 0.5 feet;
11

(3) with respect to Department standards for
12

construction in urban areas, the Department shall permit a
13

water surface profile increase of 0.1 feet; and
14

(4) with respect to mitigation analysis, a mitigation
15

analysis shall only be performed if a water surface
16

profile increase of 0.5 feet in rural areas, or of 0.1 feet
17

in urban areas, exceeds an induced head study.

18

Section 99.
Effective date.
This Act takes effect upon
19
becoming law.

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