According to ASTM C1433 and C1433M, the standard dimensions of precast concrete box culverts are as listed in the table below. Keep in mind you can stand them up or lay them down flat, and you can put as many as you want side by side.

Dimensions | Thickness | ||

ft x ft | mm x mm | inches | mm |

3 x 2 | 900 x 600 | 4 | 100 |

3 x 3 | 900 x 900 | 4 | 100 |

4 x 2 | 1200 x 600 | 5 | 125 |

4 x 3 | 1200 x 900 | 5 | 125 |

4 x 4 | 1200 x 1200 | 5 | 125 |

5 x 3 | 1500 x 900 | 6 | 150 |

5 x 4 | 1500 x 1200 | 6 | 150 |

5 x 5 | 1500 x 1500 | 6 | 150 |

6 x 3 | 1800 x 900 | 7 | 175 |

6 x 4 | 1800 x 1200 | 7 | 175 |

6 x 5 | 1800 x 1500 | 7 | 175 |

6 x 6 | 1800 x 1800 | 7 | 175 |

7 x 4 | 2100 x 1200 | 8 | 200 |

7 x 5 | 2100 x 1500 | 8 | 200 |

7 x 6 | 2100 x 1800 | 8 | 200 |

7 x 7 | 2100 x 2100 | 8 | 200 |

8 x 4 | 2400 x 1200 | 8 | 200 |

8 x 5 | 2400 x 1500 | 8 | 200 |

8 x 6 | 2400 x 1800 | 8 | 200 |

8 x 7 | 2400 x 2100 | 8 | 200 |

8 x 8 | 2400 x 2400 | 8 | 200 |

9 x 9 | 2700 x 1500 | 9 | 225 |

9 x 6 | 2700 x 1800 | 9 | 225 |

9 x 7 | 2700 x 2100 | 9 | 225 |

9 x 8 | 2700 x 2400 | 9 | 225 |

9 x 9 | 2700 x 2700 | 9 | 225 |

10 x 5 | 3000 x 1500 | 10 | 250 |

10 x 6 | 3000 x 1800 | 10 | 250 |

10 x 7 | 3000 x 2100 | 10 | 250 |

10 x 8 | 3000 x 2400 | 10 | 250 |

10 x 9 | 3000 x 2700 | 10 | 250 |

10 x 10 | 3000 x 3000 | 10 | 250 |

11 x 4 | 3300 x 1200 | 11 | 275 |

11 x 6 | 3300 x 1800 | 11 | 275 |

11 x 8 | 3300 x 2400 | 11 | 275 |

11 x 10 | 3300 x 3000 | 11 | 275 |

11 x 11 | 3300 x 3300 | 11 | 275 |

12 x 4 | 3600 x 1200 | 12 | 300 |

12 x 6 | 3600 x 1800 | 12 | 300 |

12 x 8 | 3600 x 2400 | 12 | 300 |

12 x 10 | 3600 x 3000 | 12 | 300 |

12 x 12 | 3600 x 3600 | 12 | 300 |

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