TR-73 (allendale R over Nippersink CR
PoorMcHenry County, Illinois · 0.4 MI E of Il 47 · Structure no. 056312600000000
- Built
- 1978
- 47 years old
- Condition
- Poor
- inspected October 2024
- Type
- Channel Beam
- Concrete
- Length
- 96 ft
- 3 main spans
- Daily traffic
- 850
- 2021 count
- Owner
- Town / Township
- Town or Township Highway Agency
About this bridge
TR-73 (allendale R over Nippersink CR is a concrete channel beam carrying TR-73 (allendale R over Nippersink CR in McHenry County, Illinois. It was built in 1978, so it is 47 years old, older than the Illinois average of 45.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 850 vehicles a day, roughly 8% of them trucks, projected to reach 1,020 by 2046. The structure is 96 ft (29.2 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Superstructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was TR-73 (allendale R over Nippersink CR built?
It was built in 1978, making it 47 years old in 2025.
What condition is TR-73 (allendale R over Nippersink CR in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.
How much traffic does TR-73 (allendale R over Nippersink CR carry?
About 850 vehicles per day (2021 count), of which roughly 8% are trucks.
How long is TR-73 (allendale R over Nippersink CR?
The structure is 96 ft (29.2 m) long with a longest span of 33 ft (10.1 m) and a deck 26 ft wide.
Who owns TR-73 (allendale R over Nippersink CR?
It is owned by the Town or Township Highway Agency.