Today's Heerte was first mentioned in 1022 in Bishop Bernward's founding charter of the monastery of St. Michael in Hildesheim. Until 1937, Heerte was a purely agricultural village. With the establishment of the Reichswerke Hermann Göring in 1937, large parts of the land belonging to Heerte were confiscated and the farmers resettled. Several barrack camps were set up around Heerte to accommodate skilled workers from Germany and abroad.

Lake Heerte had been artificially created in a wooded area near Heerte at the beginning of the 1950s and served as a sludge settling pond for iron ore washing.

The filling began in 1953 and ended in 1976. Today, the 272-hectare site of the former sewage pond 3, including a small remnant of the former forest, is a nature reserve.

The Salzgitter district group of the Nature and Biodiversity Conservation Union (NABU) has identified 301 bird species here in long-term population surveys; 115 of them are endangered.

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