Little Rock Dam (original) (raw)
Little Rock Dam, also known as Littlerock Dam, or officially as Little Rock-Palmdale Dam, is a concrete gravity dam on Little Rock Creek in Los Angeles County, California, about 5 mi (8.0 km) south of Palmdale. The dam and Little Rock Reservoir are owned by the Palmdale Water District and Littlerock Creek Irrigation District and are used for agricultural and municipal water supply and flood control.
| Property | Value |
|---|---|
| dbo:Infrastructure/length | 0.1755648 |
| dbo:abstract | Little Rock Dam, also known as Littlerock Dam, or officially as Little Rock-Palmdale Dam, is a concrete gravity dam on Little Rock Creek in Los Angeles County, California, about 5 mi (8.0 km) south of Palmdale. The dam and Little Rock Reservoir are owned by the Palmdale Water District and Littlerock Creek Irrigation District and are used for agricultural and municipal water supply and flood control. The dam is 124 ft (38 m) high from foundation to crest and spans 576 ft (176 m) across the canyon, forming a reservoir with a capacity of 3,700 acre⋅ft (4,600,000 m3). The reservoir has a surface area of 108 acres (44 ha) and receives water from a drainage area of 63.7 sq mi (165 km2) on the north slope of the San Gabriel Mountains. A formerly popular recreation spot, the dam, reservoir, and vicinity used to receive about 300,000 visitors each year, but since 2015, the facilities have been closed to the public. Designed by John S. Eastwood, a noted engineer of several dams in the western U.S., Littlerock was built in 1924 by the Palmdale Irrigation District (now Palmdale Water District) to provide a water supply for orchards in the area. With a height of 112 ft (34 m) and holding 2,400 acre⋅ft (3,000,000 m3) of water, it was the tallest multiple-arch reinforced concrete dam in the world at the time. The dam's design combined with its record height was highly controversial; the state mandated renovations in 1932, in which concrete buttresses were added to the dam face. In 1938, the dam nearly failed as a result of historic flooding, which led to the evacuation of hundreds of people in downstream towns. The dam was renovated again in 1966 to comply with increasing safety standards and regional urban development. In the 1970s, it was listed on the National Register of Historic Places (NRHP). In 1994, the last major renovation of the dam was completed, which involved strengthening the face with roller-compacted concrete, hiding the original multiple-arch design and transforming it to resemble a conventional gravity dam. The arches are still visible on the back face of the dam when the water level in the reservoir is low. The design changes resulted in the dam being taken off the NRHP. The dam was also raised 12 ft (3.7 m) and a new spillway added, increasing the reservoir capacity to its current 3,700 acre⋅ft (4,600,000 m3). The dam and reservoir are scheduled for a major renovation project in three separate phases. The first phase begins with construction of a subterranean grade control structure within Littlerock Reservoir at Rocky Point. The second phase is the removal of 1,165,000 cubic yards (891,000 m3) of accumulated sediment from within the reservoir over a seven- to twelve-year time frame. Finally, scheduled ongoing sediment removal of approximately 38,000 cubic yards (29,000 m3) per year to maintain design capacity. There are no plans to reopen its facilities to the public. The California Office of Environmental Health Hazard Assessment (OEHHA) has developed a safe eating advisory for Little Rock Reservoir based on levels of mercury or PCBs found in fish caught from this water body. (en) |
| dbo:description | Concrete gravity (en) |
| dbo:height | 37.795200 (xsd:double) |
| dbo:lake | dbr:Little_Rock_Dam__Lake__1 |
| dbo:length | 175.564800 (xsd:double) |
| dbo:location | dbr:California dbr:United_States |
| dbo:openingYear | 1924-01-01 (xsd:gYear) |
| dbo:part | dbr:Little_Rock_Dam__PowerStation__1 |
| dbo:river | dbr:Little_Rock_Creek_(Los_Angeles_County,_California) |
| dbo:wikiPageID | 44570546 (xsd:integer) |
| dbo:wikiPageLength | 8841 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID | 945850192 (xsd:integer) |
| dbo:wikiPageWikiLink | dbr:California dbr:San_Gabriel_Mountains dbr:List_of_dams_and_reservoirs_in_California dbr:Little_Rock_Creek_(Los_Angeles_County,_California) dbr:United_States dbr:Los_Angeles_Flood_of_1938 dbr:Los_Angeles_County,_California dbr:California_Office_of_Environmental_Health_Hazard_Assessment dbc:Dams_in_California dbc:Roller-compacted_concrete_dams dbc:Multiple-arch_dams dbr:Palmdale,_California dbr:Roller-compacted_concrete dbc:Gravity_dams dbc:Dams_completed_in_1924 dbr:Polychlorinated_biphenyl dbr:National_Register_of_Historic_Places dbr:John_S._Eastwood dbr:Spillway |
| dbp:damCrosses | Little Rock Creek (en) |
| dbp:damType | Concrete gravity (en) |
| dbp:imageCaption | West end of dam, looking southeast (en) |
| dbp:location | dbr:California dbr:United_States |
| dbp:locationMap | California (en) |
| dbp:locationMapCaption | Location of the dam in California (en) |
| dbp:name | Little Rock Dam or Littlerock Dam (en) |
| dbp:nameOfficial | Little Rock-Palmdale Dam (en) |
| dbp:opening | 1924 (xsd:integer) |
| dbp:owner | Littlerock Creek Irrigation District (en) Palmdale Water District (en) |
| dbp:resName | Little Rock Reservoir (en) |
| dbp:wikiPageUsesTemplate | dbt:LA_County_dams dbt:Commonscat_inline dbt:Convert dbt:Coord dbt:Reflist dbt:Infobox_dam |
| dcterms:subject | dbc:Dams_in_California dbc:Roller-compacted_concrete_dams dbc:Multiple-arch_dams dbc:Gravity_dams dbc:Dams_completed_in_1924 |
| gold:hypernym | dbr:Dam |
| georss:point | 34.48583333333333 -118.02194444444444 |
| rdf:type | owl:Thing dbo:Infrastructure wikidata:Q12323 dbo:Dam yago:WikicatDamsCompletedIn1924 yago:WikicatDamsInCalifornia yago:WikicatMultiple-archDams geo:SpatialThing dbo:ArchitecturalStructure yago:Artifact100021939 yago:Barrier102796623 yago:Dam103160309 yago:Object100002684 yago:Obstruction103839993 yago:PhysicalEntity100001930 yago:WikicatGravityDams yago:YagoGeoEntity yago:YagoPermanentlyLocatedEntity yago:Structure104341686 yago:Whole100003553 |
| rdfs:comment | Little Rock Dam, also known as Littlerock Dam, or officially as Little Rock-Palmdale Dam, is a concrete gravity dam on Little Rock Creek in Los Angeles County, California, about 5 mi (8.0 km) south of Palmdale. The dam and Little Rock Reservoir are owned by the Palmdale Water District and Littlerock Creek Irrigation District and are used for agricultural and municipal water supply and flood control. (en) |
| rdfs:label | Little Rock Dam (en) |
| owl:sameAs | freebase:Little Rock Dam yago-res:Little Rock Dam wikidata:Little Rock Dam geodata:Little Rock Dam http://ceb.dbpedia.org/resource/Little_Rock-Palmdale_Dam https://global.dbpedia.org/id/U5Fn |
| geo:geometry | POINT(-118.02194213867 34.485832214355) |
| geo:lat | 34.485832 (xsd:float) |
| geo:long | -118.021942 (xsd:float) |
| prov:wasDerivedFrom | wikipedia-en:Little_Rock_Dam?oldid=945850192&ns=0 |
| foaf:isPrimaryTopicOf | wikipedia-en:Little_Rock_Dam |
| foaf:name | Little Rock Dam or Littlerock Dam (en) Little Rock-Palmdale Dam (en) |
| is dbo:wikiPageDisambiguates of | dbr:Little_Rock_(disambiguation) |
| is dbo:wikiPageRedirects of | dbr:Littlerock_Dam dbr:Little_Rock_Creek_Dam |
| is dbo:wikiPageWikiLink of | dbr:List_of_dams_and_reservoirs_in_California dbr:Little_Rock_Creek_(Los_Angeles_County,_California) dbr:Los_Angeles_flood_of_1938 dbr:Alpine,_Los_Angeles_County,_California dbr:Palmdale,_California dbr:John_Samuel_Eastwood dbr:Lake_Palmdale dbr:Little_Rock_(disambiguation) dbr:Littlerock_Dam dbr:Little_Rock_Creek_Dam |
| is foaf:primaryTopic of | wikipedia-en:Little_Rock_Dam |