The Bhumibol Dam was constructed across the Ping River at Khao Kaew Sub-district, Sam Ngao District of Tak Province. Constructed in 1958 and completed in 1964 with the dam height of 154 m, crest length of 486 m and retention capacity of 13,462 million m3, the dam is the first and largest multipurpose concrete arch dam in Thailand. It has provided great benefits to the country including electrical generation, irrigation in collaboration with the Sirikit Dam for the areas under the Greater Chao Phraya Project of 1,200,000 ha in the wet season and 480,000 ha in the dry season, flood mitigation of the Central Plain, inland navigation as well as prevention of sea water intrusion in the lower Chao Phraya and Tha Chin river basin.
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Huai Nam Dang National Park is situated on top of the ridge of hills and the same range as Chiang Dao mountain range. The highest peak-Doi Chang peak (at 1,962 metres above sea level) is the vital source of important streams which flow into the Pai river, Ping river, and Taeng river.
It was formerly know as an area of Doi Sam Muen highland development project which was initited by His Majesty the King to solve the problem of forest encroachment and poaching, as well as to enhance the lives of the local hilltribe people. As this area is filled with attractive natural condition and virginal forests provided vital watersheds, Huai Nam Dang was declared the 81st national park of Thailand by the Royal Forest Department on 14 August 1995. อุทยานแห่งชาติห้วยน้ำดัง มีพื้นที่ครอบคลุมอำเภอแม่แตง อำเภอเวียงแหง จังหวัดเชียงใหม่ และอำเภอปาย จังหวัดแม่ฮ่องสอน รวมเนื้อที่ทั้งหมดประมาณ 1,252 ตารางกิโลเมตร ลักษณะภูมิประเทศเป็นเทือเขาและภูเขาสูงสลับซับซ้อน มีภูเขาที่สูงที่สุด คือดอยช้าง เป็นป่าต้นน้ำลำธาร มีลำห้วยน้อยใหญ่มากมาย การ เดินทาง ใช้ทางหลวงหมายเลข 1095 สายปาย – แม่มาลัย ถึงกิโลเมตรที่ 65 – 66 มีทางแยกซ้ายเข้าไปประมาณ 5 กิโลเมตร ถึงบริเวณที่ทำการอุทยานฯ มีบ้านพักและสถานที่กางเต็นท์บริการนักท่องเที่ยว สำรองบ้านพักและเครื่องนอนเต็นท์ได้ที่ โทร. 0-5326-3910, 0-5324-8491, 0-5381-934 หรือ กรมอุทยานแห่งชาติ สัตว์ป่า และพันธุ์พืช กรุงเทพฯ โทร. 0-2562-0760 www.dnp.go.th
The forest in the park is one of the country’s very significance and valuable heritage. Forests include Moist Evergreen Forest, Pine forest and Mixed Deciduous Forest, worth in economic like teak and mountain pine. Dipterocarpspp. Xylia xylocarpa, Pterocarpus, macrocapus Terminalia sp. and Lagerstroemiasp. to name a few. In addition to these, there are many beautiful flowers including vanda orchid, phycastylis and rhododendron. Sphagnum Moss and osmanda fern are found at higher levels in the park. fifty years ago, the mountain peaks were home of hill tribe people.
Continuing north on the main summit road, turn left at km. 41.8 over a bridge on a paved road which leads to a magnificent chedi to honour the 60th birthday of King Bhumipol and Queen Sirikit
Wachirathan Waterfall or Muangyong Waterfall is a 70-meter-high waterfall, having originated in Mae Klang Gully and being located near km 22, Chomthong-Doi Inthanon Raod. At the Waterfall, there are many caves; and the most beautiful one is Borijinda Cave, a large cave with stalactite and stalagmite
The Waterfall was formerly called “Lao Lee Waterfall”, which was named after the headman of a nearby tribesman village. After that Mr.Ror.Vor. Jakthong Thongyai, a former Minister of Agriculture and Cooperatives, named the Waterfall “Siriphum” to enhance the prestige of His Majesty the King and Her Majesty the Queen. The Waterfall is located near km 31, Chomthong-Doi Inthanon Raod
Mae Ya Waterfall is a large waterfall of 260 meters high, located in the south of the National Park. The Waterfall originated in Mae Ya Gully. Many tourists claimed that the Waterfall is one of the most beautiful waterfalls in Thailand since the Waterfall is like a combination of different waterfalls. The Waterfall can be accessed from the right hand side of Chomthong-Hod Road
Ob Luang National Park is an amazing natural attraction comprising both splendid natural charms as well as mysterious scenery. A zigzagging river flows in front of a picturesque gorge. The area is a high, steep cliff with a narrow passage, creating strong currents and powerful echoes. An area in the north of this stream is teeming with various kinds of plants that provide a pleasant ambience all year round. Magnificent views of Ob Luang National Park can be seen from the bridge that links with the gorge. An interesting prehistoric archaeological site is also located in the park.
