Be it enacted by the Senate and House of Representa-
tives of the United States of America in Congress assembled, 
SECTION 1. SHORT TITLE. 
This Act may be cited as the ‘‘Thunder Bay National 
Marine Sanctuary and Underwater Preserve Boundary 
Modification Act’’. 
SEC. 2. FINDINGS AND PURPOSES. 
(a) FINDINGS.—Congress makes the following findings: 
(1) Thunder Bay National Marine Sanctuary 
and Underwater Preserve in Lake Huron contains 
more than 100 recorded historic vessel losses. 
(2) The areas immediately surrounding the 
Sanctuary, including the offshore waters of Presque 
Isle and Alcona Counties, Michigan, contain an equal 
number of historic vessel losses. 
(3) Many of these shipwrecks and underwater 
cultural resources are popular recreational diving 
destinations, and all contribute to our collective mari-
time heritage. 
(4) These resources are susceptible to damage 
from human activities, and must be properly pre-
served for themselves and to protect the economic via-
bility of their contribution to national and regional 
economies. 
(b) PURPOSES.—The purposes of this Act are— 
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(1) to expand the Thunder Bay National Marine 
Sanctuary and Underwater Preserve boundaries to 
encompass the offshore waters of Presque Isle and 
Alcona Counties, Michigan and outward to the inter-
national border between the United States and Can-
ada; and 
(2) to provide the underwater cultural resources 
of those areas equal protection to that currently af-
forded to the Sanctuary. 
SEC. 3. DEFINITIONS. 
In this Act: 
(1) SANCTUARY.—The term ‘‘Sanctuary’’ means 
the Thunder Bay National Marine Sanctuary and 
Underwater Preserve. 
(2) SECRETARY.—The term ‘‘Secretary’’ means 
the Secretary of Commerce. 
SEC. 4. SANCTUARY BOUNDARY ADJUSTMENT. 
(a) BOUNDARY ADJUSTMENT.—Notwithstanding any 
provision of law or regulation, including section 922.190 
of title 15, Code of Federal Regulations, as in effect on the 
date of the enactment of this Act, the Sanctuary shall con-
sist of the geographic area described in subsection (b). 
(b) EXPANDED BOUNDARY ADJUSTMENT.—The area 
referred to in subsection (a) is all submerged lands, includ-
ing the underwater cultural resources, lakeward of the mean 
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high waterline, within the boundaries of a line formed by 
connecting points in succession beginning at a point along 
the mean high water line located approximately at 
45.6262N, 84.2043W at the intersection of the northern 
Presque Isle and northeastern Cheboygan County boundary, 
then north to a point approximately 45.7523N, 84.2011W, 
then northeast to a point approximately 45.7777N, 
84.1231W, then due east to the international boundary be-
tween the United States and Canada approximately located 
at 45.7719N, 83.4840W then following the international 
boundary between the United States and Canada in a gen-
erally southeasterly direction to a point approximately 
44.5128N, 83.3186W at the intersection of the southern 
Alcona County and northern Iosco County boundary, re-
turning to the first point along the mean high water line. 
(c) AUTHORITY TO MAKE MINOR ADJUSTMENTS.—The 
Secretary may make minor adjustments to the boundary 
described in subsection (b) to facilitate enforcement and 
clarify the boundary to the public provided the resulting 
boundary is consistent with the purposes described in sec-
tion 2(b). 
(d) INCLUSION IN THE SYSTEM.—The area described 
in subsection (b), as modified in accordance with subsection 
(c), shall be managed as part of the National Marine Sanc-
tuary System established by section 301(c) of the National 
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Marine Sanctuaries Act (16 U.S.C. 1431(c)), in accordance 
with that Act. 
(e) UPDATED NOAA CHARTS.—The Secretary shall— 
(1) produce updated National Oceanic and At-
mospheric Administration charts for the area in 
which the Sanctuary is located; and 
(2) include on such charts the boundaries of the 
Sanctuary described in subsection (b), as modified in 
accordance with subsection (c). 
SEC. 5. EXTENSION OF REGULATIONS AND MANAGEMENT. 
(a) REGULATIONS.—The regulations applicable to the 
Sanctuary codified in subpart R of part 922 of title 15, 
Code of Federal Regulations, as in effect on the date of the 
enactment of this Act, shall apply to the geographic area 
added to the Sanctuary pursuant to section 4, unless the 
Secretary specifies otherwise by regulation. 
(b) EXISTING CERTIFICATIONS.—The Secretary may 
certify that any license, permit, approval, other authoriza-
tion, or right to conduct a prohibited activity made pursu-
ant to section 922.194 of title 15, Code of Federal Regula-
tions, that exists on the date of the enactment of this Act 
shall apply to such an activity conducted within the geo-
graphic area added to the Sanctuary pursuant to section 
4. 
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(c) DATE OF SANCTUARY DESIGNATION.—For pur-
poses of section 922.194 of title 15, Code of Federal Regula-
tions, the date of the enactment of this Act shall be deemed 
to be the date of Sanctuary designation. 
(d) MANAGEMENT PLAN.—To the extent practicable, 
the Secretary shall apply the management plan in effect 
for the Sanctuary on the date of the enactment of this Act 
to the geographic area added to the Sanctuary pursuant 
to section 4. 
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