How many number of lakes are there in the Valdez-Cordova (CA) area?
CREATE TABLE "table1_17978052_2" (
  "num_s_dam_and_gnis_query_link" real,
  "num_s_lake_and_gnis_query_link" real,
  "num_s_reservoir_and_gnis_query_link" real,
  "borough_or_census_area" text,
  "comment" text
);
SELECT MIN("num_s_lake_and_gnis_query_link") FROM "table1_17978052_2" WHERE "borough_or_census_area"='Valdez-Cordova (CA)';