46 CFR § 45.71 - Midsummer freeboard.

---
identifier: "/us/cfr/t46/s45.71"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "46 CFR § 45.71 - Midsummer freeboard."
title_number: 46
title_name: "Shipping"
section_number: "45.71"
section_name: "Midsummer freeboard."
chapter_name: "COAST GUARD, DEPARTMENT OF HOMELAND SECURITY"
subchapter_number: "E"
subchapter_name: "LOAD LINES"
part_number: "45"
part_name: "GREAT LAKES LOAD LINES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "46 U.S.C. 5104, 5108; Department of Homeland Security Delegation No. 0170.1."
regulatory_source: "CGD 73-49R, 38 FR 12290, May 10, 1973, unless otherwise noted."
cfr_part: "45"
---


# 45.71 Midsummer freeboard.

The minimum midsummer freeboard (fms) in inches is obtained by the formula:

*fms* = *f*(*s*) − 0.3Ts

where:

*f*(*s*) = summer freeboard in inches

Ts = distance in feet between top of keel and the summer load line.