# 17 Ill. Adm. Code 3702.90: Section 3702.90 Datum For Dam Elevations

> Illinois · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T17_P3702_S3702_90

## Section

- **Citation:** 17 Ill. Adm. Code 3702.90
- **Heading:** Section 3702.90 Datum For Dam Elevations
- **Jurisdiction:** Illinois
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Illinois Administrative Code / Title 17 CONSERVATION / CHAPTER I: DEPARTMENT OF NATURAL RESOURCES / Part 3702 CONSTRUCTION AND MAINTENANCE OF DAMS / Section 3702.90 Datum For Dam Elevations

## Text

Section 3702
Section 3702.90  Datum For
Dam Elevations
All elevations for Class I and
Class II dams shall be on the National Geodetic Vertical Datum (same as mean
sea level (MSL) 1179 adj.).  Where possible, Class III dams shall also be on
the NGVD datum.  (Datum means the level surface used for reference in determining
the elevations of features of a dam)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_IL_IAC_T17_P3702_S3702_90. Check the current official text before relying on it. Not legal advice.