| Location | Toronto, ON |
| Size/Type | 2700mm Round Brick, 1800mm Brick Arch |
| Drain Type | Stormwater, CSO |
| Length | 1.6km (main trunk) |
| Features | Overflow tanks, lots of brick |
| AOTU Rating |  |
| Discovered By | Angels of the Underground |
| First Documented Exploration | Angels of the Underground |
| Notes | |
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AOTU Members present for exploration: Umbra, Ignavus & Rico Friends of AOTU present: none Photographs by: Umbra & Ignavus | |
 Start PicLens SlideShow | |
It's Big. Period. The upstream portion of Humble Howard is being redirected to the MTI (Mid-Toronto Interceptor), which leaves the downstream portion virtually untouched unless a HUGE rainfall occurs. Three large overflow/storage tanks are located just downstream of where we entered. Roughly 20'x80' in size. On one side, overflow windows and a slide lead to the glorious brick drain itself. Side pipes downstream lead to other discoveries not yet fully explored, and a partially blocked end leads to a near dry pipe that connects to the infall at High Park South, and ends up slowly flooding as it flows under Lakeshore Rd, eventually being redirected (we believe) to the WBST.
| Overflow/Storage Tanks |
| Main Trunk |
| High Park South Infall |
| AOTU :: Drains :: Waterfront :: Humble Howard |
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