Gadar Kogin Neja da ke Onitsha (wanda aka fi sani da Gadar Onitsha), Jihar Anambra, Nijeriya ta haɗu kudu maso gabashin Nijeriya da yammacin Nijeriya a kan Kogin Neja . Wanda a Asaba a jihar Delta, Najeriya. Karatun mai yiwuwa da kuma yin la'akari da yadda za'a iya gina gada a hayin Kogin Niger daga Asaba zuwa Onitsha wanda Netherlands engineering Consultants Hague, Holland (NEDECO) suka gudanar a cikin shekarun 1950, Tsakanin 1964 da 1965, katafaren kamfanin gine-ginen faransa, Dumez, ya gina gadar Neja, don haɗa Onitsha da Asaba a cikin jihohin Anambara da Delta a yanzu a kan kuɗin da aka kiyasta na £ 6.75 miliyan. An kammala ginin gadar a watan Disambar shekara ta alib 1965. Bayan an kammala, gada ya kasance ƙafa takwas da ɗari huɗu da ashirin (8 × 420 ft.) Tare da hanyar mota mai ƙafa 36-tsakiyar truss da kuma tafiya mai tafiya a bangarorin biyu na hanyar motar. Firayim Minista na lokacin Marigayi Alhaji Tafawa Balewa ne ya ba da umarnin kuma aka bude shi don zirga-zirga a watan Disambar shekara ta alib 1965.