How many dams are there in the Nome (CA) area?
create table table_17978052_2 (_number_s_dam_and_gnis_query_link integer, borough_or_census_area varchar, PRIMARY KEY (_number_s_dam_and_gnis_query_link))
select min(_number_s_dam_and_gnis_query_link) from table_17978052_2 where borough_or_census_area = "nome (ca)"