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hospital costs. The work proved moderately dangerous and accounted for numerous injuries and twelve deaths. However, despite the hazards and reduction in pay, it appears there was a unique level of camaraderie at the
Arrowrock site. As stated above, the workers set several construction records, not the least of which included the 527,300 cubic yards (403,100 m) of concrete laid on the dam.
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temperature of the setting concrete, ensuring the dams strength. It is 225 feet (69 m) thick at the base and 15 feet (4.6 m) thick at the crest. It is serviced by 25 outlets some of which are designed to regulate themselves, another first in engineering. Ten outlets were built for an eventual power plant, but they have yet to be used.
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running water and an efficient sewage system. Along with the
Reclamation offices, the Arrowrock camp carried a hospital, mess hall, post office, and hotel. Workers and visitors were offered lodging in the site's hotel, bunkhouses, or cottages. In addition to the outdoor recreational activities, the camp also operated a
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In total, the dam contains 585,160 cubic yards (447,390 m) of concrete and the reservoir holds over 286,000 acre-feet (353,000,000 m) of irrigation water. Within the first week of operation, an estimated 12,000 visitors braved the canyon ride to see the dam. However, as interest waned, the
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in 2002, it is now on ready reserve status and occasionally provides surplus power during times of peak demand. Special care was made to maintain the historic qualities of the powerhouse. The original governors, slate control panels, transformers, overhead crane, and generator housings, although no
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To provide power for the site, Reclamation retrofitted The Boise River
Diversion Dam with a small powerhouse. Finished in 1912, the plant's three generators produced 1,500 kilowatts of electricity for Arrowrock's camp, sawmills, and giant cement mixers. The German made Allis-Chalmers 725 horsepower
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Some significant problems existed with construction of the railroad. The
Barberton Lumber Company owned the road's right-of-way. That meant that the Reclamation Service needed to come to an agreement over ownership of the rail line. In an unprecedented move, the government agreed to lease the track
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trucks serviced both crews and visitors and provided an unexpected level of mobility throughout the campsite. In an effort to alleviate some of the discomfort along the Boise & Arrowrock, Reclamation purchased a 60-ton locomotive and several new passenger cars. For almost five years, the train
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However, once they arrived, most passengers were surprised by what they found. Not only was the view breathtaking but the "work" camp offered amenities that were unavailable to some residents of the
Treasure Valley. Not only was the site fully powered, but also it provided a central heating plant,
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to lay the track from Barber to the work site. Although the construction was delayed several times by the shortage of railroad ties, workers finished the track in early
November. By most accounts, the trip through the canyon was a very long and harrowing event. For the first several months, riders
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The
Reclamation Service spared no expense regarding the equipment at Arrowrock Dam. Along with the refurbished 70-ton Atlantic steam shovel from Deer Flat were two versatile 18-ton "dinkey" excavators and several brand new dump cars. The cement mixers produced over 2,000 barrels per day and ran
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pulled in anywhere from $ 3.00 to $ 4.00. In addition, several deductions were made for room and board. Workers could choose between the dormitory style bunkhouses at $ 1.25 a month or a private room at $ 4.00. Seventy-five cents was deducted each day for meals and $ 1.00 a month went towards
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in 1924, with a height of 366 feet (111.6 m). In addition, engineers pioneered the use of dam instrumentation with the placement of ten thermometers embedded deep within the structure's concrete. Along with innovative contraction joints, the
Reclamation Service was able to control the
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uninterrupted for almost 30 months. Two 12-ton
Lidgerwood cableways hovered over the site and moved material and concrete from their loading grounds to the dam site. Scores of horse teams helped carry equipment and gravel from the camp to the various work areas. Additionally, one
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refused to honor the pact between
Barberton and Reclamation, the Arrowrock & Boise terminal was reduced to a field just outside the Barber lumberyard. On August 22, 1910, the entire deal was finalized and work began on the line to the Arrowrock site.
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from Barberton but run the actual locomotive. Part of this agreement stipulated that the line would remain a common carrier. That made the Arrowrock & Boise Railroad the first publicly owned line in the nation. The Service hid this fact from President
587:(541 kW) turbines, the first in the world to be built with a vertical shaft design. Along with the power lines, government workers hung a two-way phone cable to connect Arrowrock with the outside world. In 1976, the power plant was added to the
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yet failed for lack of funding. The Arrowrock site is at the confluence of the main channel and the south fork. That was to be the most ambitious project to date for Reclamation. At 348 feet (106 m), Arrowrock would be the largest
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From 1935 to 1937, construction at Arrowrock raised the dam five feet (1.5 m), increasing its capacity by 9,000 acre-feet (11,100,000 m), and replaced deteriorating concrete on the dam's downstream face and spillway channel.
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ran faithfully through the canyon, delivering over 89,500 visitors and crewmen. Also, during its commission, the Boise & Arrowrock traveled more than 110,000 miles (180,000 km) and carried 14,000,000 tons of freight.
551:. The railroad would begin at the Barberton mill near the Diversion Dam and extend to through a winding canyon up to Arrowrock. Even before the dam had been approved, Reclamation began work on the rail line.
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when it applied for the Arrowrock Dam's approval. Fortunately for Reclamation, Taft failed to recognize the loophole and in June 1910, the entire project went forward. However, when the
547:, routing supplies to the worksite would be a massive undertaking unto itself. The Reclamation Service elected to construct a new rail line on the old wagon road leading north to
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From 2001 to 2004, ten aging Ensign valves were removed and replaced with clamshell gates. By 2011, work was completed to permanently plug all five sluice gate outlets.
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in the world. Prior to construction, considerable preparatory work would need to be completed. As the structure was some twenty miles (32 km) upstream from the
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On October 4, 1915, the Arrowrock Dam was finally dedicated. As stated above, it was the tallest dam in the world for nine years, until the completion of the
531:. After several surveys, engineers decided upon the Arrowrock site which had previously been the site of a private irrigation venture under the direction of
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Work began on the Arrowrock Dam in early 1912 and moved along at a record-setting pace. As labor was becoming more plentiful with the completion of
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Arrowrock & Boise Railroad schedule dropped significantly. The campsite, once a bustling hive of activity, was quickly becoming a
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570:'s Manly Brothers won the contract for grading the Arrowrock & Boise road in May 1911. The government called for
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A 15-MW powerplant was added to Arrowrock Dam in March 2010, and the transmission line to the dam was updated.
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were asked to disembark at the unfinished Gooseneck Bridge while the cars were winched across one at a time.
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and the Diversion Dam, wage rates began to decrease. Common laborers were now offered $ 2.40 and day while
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874:- major storage reservoirs in the Boise & Payette River basins - current levels & flows
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662:. On August 11, 1916, the government decommissioned its very first public carrier.
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880:(HAER) documentation, filed under Boise River, Twin Springs, Boise County, ID:
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806:"Arrowrock Dam Recognized as Historic Civil Engineering Landmark"
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894:", 17 photos, 6 data pages, 2 photo caption pages
929:", 10 photos, 3 data pages, 1 photo caption page
901:", 14 photos, 4 data pages, 1 photo caption page
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began to consider another storage facility farther east on the
468:. Opened 109 years ago in 1915, it is located on the border of
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922:", 2 photos, 2 data pages, 1 photo caption page
915:", 6 photos, 4 data pages, 1 photo caption page
908:", 5 photos, 3 data pages, 1 photo caption page
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longer functional, were retained for historic purposes.
832:. San Francisco: Mining and Scientific Press. pp.
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965:Buildings and structures in Elmore County, Idaho
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960:Buildings and structures in Boise County, Idaho
484:for Arrowrock is 3,219 feet (981 m) above
970:Historic American Engineering Record in Idaho
497:National Historic Civil Engineering Landmark
808:(Press release). U.S. Bureau of Reclamation
427:Reservoir side of Arrowrock Dam spring 2016
390:U.S. National Register of Historic Places
985:United States Bureau of Reclamation dams
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995:Energy infrastructure completed in 1912
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16:Dam in Boise and Elmore counties, Idaho
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435:Outlet side of Arrowrock Dam fall 2022
608:Arrowrock Dam tour from Boise on the
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1020:Historic Civil Engineering Landmarks
878:Historic American Engineering Record
803:
721:List of dams and reservoirs in Idaho
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589:National Register of Historic Places
955:Hydroelectric power plants in Idaho
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501:American Society of Civil Engineers
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289:2,200 square miles (5,700 km)
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591:. After being refurbished by the
279:300,850 acre-feet (0.371 km)
829:Interviews with Mining Engineers
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503:in 2016, and is operated by the
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826:Rickard, Thomas Arthur (1922).
593:Bonneville Power Administration
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927:Arrowrock Dam, Spillway Bridge
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980:Lakes of Elmore County, Idaho
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63:Show map of the United States
60:Location in the United States
1015:1915 establishments in Idaho
975:Lakes of Boise County, Idaho
495:The dam was designated as a
480:and reservoir. The spillway
371:United States historic place
195:; 109 years ago
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804:Ross, Anette (2016-09-09).
732:List of dams and reservoirs
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305:3,210 ft (978 m)
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872:U.S. Bureau of Reclamation
859:U.S. Bureau of Reclamation
794:, US Bureau of Reclamation
610:Oregon Short Line Railroad
505:U.S. Bureau of Reclamation
476:counties, upstream of the
297:3,100 acres (12.5 km)
212:U.S. Bureau of Reclamation
545:Boise River Diversion Dam
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33:Aerial view from the west
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925:HAER No. ID-27-F, "
918:HAER No. ID-27-E, "
913:Arrowrock Dam, Residence
911:HAER No. ID-27-D, "
906:Arrowrock Dam, Warehouse
904:HAER No. ID-27-C, "
899:Arrowrock Dam, Residence
897:HAER No. ID-27-B, "
890:HAER No. ID-27-A, "
1000:Dams on the Boise River
892:Arrowrock Dam, Spillway
711:Renewable energy portal
492:water for agriculture.
349:Installed capacity
256:1,150 feet (351 m)
175:Construction began
990:Dams completed in 1915
920:Arrowrock Dam, Cistern
883:HAER No. ID-27, "
727:List of lakes in Idaho
723:- 4th largest in Idaho
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453:United States, on the
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151:43.59556°N 115.92222°W
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302:Normal elevation
248:350 feet (107 m)
224:Type of dam
771:, NPDP Dam Directory
533:Arthur De Wint Foote
363:Columbia River Basin
328:Commission date
156:43.59556; -115.92222
950:Reservoirs in Idaho
557:William Howard Taft
525:Reclamation Service
519:Arrowrock Dam, 1925
285:Catchment area
276:Total capacity
270:Arrowrock Reservoir
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864:2012-09-26 at the
767:2012-03-12 at the
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600:Work commencement
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335:14 years ago
294:Surface area
218:Dam and spillways
190:Opening date
94:Show map of Idaho
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810:. Retrieved
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697:Water portal
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511:Preparations
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459:southwestern
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88:Location in
651:Switzerland
529:Boise River
455:Boise River
318:Operator(s)
239:Boise River
154: /
142:115°55′20″W
130:Coordinates
939:Categories
812:2021-02-05
738:References
666:Later work
660:ghost town
647:Schräh dam
641:Dedication
632:and seven
549:Idaho City
490:irrigation
464:, east of
170:Irrigation
139:43°35′44″N
122:counties,
1005:Arch dams
617:Deer Flat
486:sea level
482:elevation
261:Reservoir
862:Archived
765:Archived
681:See also
541:arch dam
538:concrete
408:72000437
235:Impounds
229:Arch dam
208:Owner(s)
112:Location
842:2664362
499:by the
451:western
449:in the
340:2010-03
338: (
266:Creates
198: (
180: (
167:Purpose
104:Country
840:
474:Elmore
253:Length
245:Height
120:Elmore
630:Buick
470:Boise
466:Boise
462:Idaho
353:15 MW
333:;
124:Idaho
116:Boise
90:Idaho
838:OCLC
634:Ford
581:YMCA
472:and
444:arch
417:1976
307:AMSL
200:1915
193:1915
182:1911
178:1911
118:and
834:171
649:in
457:in
447:dam
403:No.
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776:^
746:^
507:.
844:.
815:.
342:)
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184:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
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_Arrowrock_Dam_spring_2016.jpg)
