Question: Who manages the birdwatching site found south of the dam originally known as the Boulder Dam?

Context paragraphs:
Tabqa Dam: The Tabqa Dam (Arabic: سد الطبقة‎ ‎ , "Sadd al-Ṭabqa"; Kurdish: Bendava Tebqa‎ ; Syriac: ܣܟܪܐ ܕܛܒܩܗ‎ , "Sekro d'Tabqa " ), or al-Thawra Dam as it is also named (Arabic: سد الثورة‎ ‎ , "Sadd al-thawra", literally "Dam of the Revolution"), most commonly known as Euphrates Dam (Arabic: سد الفرات‎ ‎ , "Sadd al-Furāt"; Kurdish: Bendava Firatê‎ ; Syriac: ܣܟܪܐ ܕܦܪܬ‎ , "Sekro d'Frot " ), is an earthen dam on the Euphrates, located 40 km upstream from the city of Raqqa in Raqqa Governorate, Syria.  The city of Al-Thawrah is located immediately south of the dam.  The dam is 60 m high and 4.5 km long and is the largest dam in Syria.  Its construction led to the creation of Lake Assad, Syria's largest water reservoir.  The dam was constructed between 1968 and 1973 with help from the Soviet Union.  At the same time, an international effort was made to excavate and document as many archaeological remains as possible in the area of the future lake before they would be flooded by the rising water.  When the flow of the Euphrates was reduced in 1974 to fill the lake behind the dam, a dispute broke out between Syria and Iraq that was settled by intervention from Saudi Arabia and the Soviet Union.  The dam was originally built to generate hydroelectric power, as well as irrigate lands on both sides of the Euphrates.  The dam has not reached its full potential in either of these objectives.

Lake McLarty: Lake McLarty is a 219 ha freshwater lake and associated nature reserve on the Swan Coastal Plain of Western Australia.  The lake is named after a prominent pioneering family which settled in the district in the early 1860s.  It lies about 90 km south of Perth on the eastern side of the Harvey Estuary and forms part of the Peel-Yalgorup System Ramsar site.  It is an important area for waders, or shorebirds, and is a well-known birdwatching site.

Angat Watershed Forest Reserve: The Angat Watershed Forest Reserve is a conservation area that protects the drainage basin in the southern Sierra Madre range north of Metro Manila in the Philippines where surface water empties into the Angat River and its tributaries.  It is spread over an area of 62309 ha in the eastern portion of Bulacan and northern Rizal province at an altitude of between 490 and 1206 m .  The conservation area also extends to the provinces of Nueva Ecija and Quezon and is centered on an artificial lake created by the Angat Dam which, together with the Ipo Dam located 7.5 km downstream, supply 97% of the water requirement of Metro Manila via an aqueduct system to the La Mesa Dam and Reservoir and the Balara Filtration Plant in Quezon City.  The Angat Dam and Reservoir is also a major source of hydroelectricity for Metro Manila and surrounding provinces, contributing some 200 megawatts to the Luzon grid.  The watershed is a popular birdwatching site and is a biodiversity hotspot containing most of the remaining closed-canopy forests in Central Luzon.

Topock Marsh: The Topock Marsh is one of the larger birdwatching sites found in the Lower Colorado River Valley, found from south of Hoover Dam to the Colorado River Delta in Mohave County, Arizona.  This public land is managed by the US Fish and Wildlife Service, and available to the public for recreational purposes.

Hoover Dam: Hoover Dam, originally known as Boulder Dam from 1933 to 1947, when it was officially renamed Hoover Dam by a joint resolution of Congress, is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona.  It was constructed between 1931 and 1936 during the Great Depression and was dedicated on September 30, 1935, by President Franklin D. Roosevelt.  Its construction was the result of a massive effort involving thousands of workers, and cost over one hundred lives.  The dam was named after President Herbert Hoover.

Bloemhof Dam: Bloemhof Dam is a dam in South Africa.  It was originally known as the Oppermansdrif Dam when under construction during the late 1960s.  It is located at the confluence of the Vaal River and the Vet River, on the border between the provinces North West and Free State.  The dam wall has a total length of 4270 m The reservoir is very shallow, and therefore needs a large area to mean anything for water storage.  The area around the reservoir (dam), has been a protected area, but because it lies on the border between provinces, these became two separate nature reserves.  On the North West Province side lies the Bloemhof Dam Nature Reserve, on the Free State side is the Sandveld Nature Reserve.

Martin Dam: Martin Dam is a concrete arch gravity dam on the Tallapoosa River in Alabama in the United States, about 10 mi southwest of Dadeville.  Impounding the 40000 acre Lake Martin, the dam was built in the 1920s to provide flood control, hydroelectric power generation and water supply.  Originally known as the Cherokee Bluffs dam, the dam is named in honor of Thomas Wesley Martin, president of the Alabama Power Company during the dam's construction.

Boulder Dam Hotel: The Boulder Dam Hotel, also known as the Boulder City Inn, is a hotel located in Boulder City, Nevada that is listed on the United States National Register of Historic Places.  It was designed in the Colonial Revival style by architect Henry Smith.  The hotel was built to accommodate official visitors and tourists during the building of Boulder Dam, now Hoover Dam.

Lost City Museum: The Lost City Museum, formerly known as the Boulder Dam Park Museum, was built by the CCC conservation corps in 1935 and was operated by the National Park Service to exhibit artifacts from the Pueblo Grande de Nevada archaeological sites.  The museum is located in Overton, Nevada and is one of seven managed by the Nevada Division of Museums and History, an agency of the Nevada Department of Tourism and Cultural Affairs.

Meeker Island Lock and Dam: The Meeker Island Lock and Dam (originally known as Lock and Dam No. 2) was the first lock and dam facility built on the Upper Mississippi River.  After a construction period lasting eight years, the site was only in operation for five years from 1907 to 1912 when the growing interest in hydroelectric power led to design and construction of today's Lock and Dam No. 1 a few miles downriver.  It was realized that the new dam could take over the function provided by this first site and another small dam a short distance downriver.

Supporting paragraphs: Topock Marsh Hoover Dam
Answer: US Fish and Wildlife Service