What is the {gravity dam} with the {MAX(hydraulic head)} whose {located on terrain feature} is {Columbia River}  ?
What is the gravity dam with the most hydraulic head whose located on terrain feature is Columbia River?
select ?ent where { ?ent wdt:P31 wd:Q3497167 . ?ent wdt:P4441 ?obj . ?ent wdt:P706 wd:Q2251 } ORDER BY DESC(?obj)LIMIT 5 
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q3497167>.

?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P4441>.
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj1.

?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P706> .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q2251> .

}
ORDER BY DESC(?obj1)
LIMIT 5
What is the dam with the largest hydraulic head located on the earthern features of the Columbia River?