Is I 15 Safe?
I 15 in Nevada has a Condition Score of 81/100 (Grade A). The deck is rated 7/9, superstructure 8/9, and substructure 7/9. The bridge is not currently classified as structurally deficient. Built in 2001 (25 years old), it carries approximately 296K vehicles per day.
I 15 carries an A on the BridgeSafety Condition Score with 81/100. Deck, superstructure, and substructure ratings all sit in the better tier of the FHWA NBI distribution. The bridge is structurally sound by federal standards.
The bridge was built in 2001, making it 25 years old — past the early-life period but still well within typical service life. Routine inspections and modest repair work are normal for bridges in this age band. I 15 carries an average daily traffic count of 296,000 vehicles, with 10 lane(s) crossing Sr589 Sahara Av. The owning agency is State Highway Agency; bridge inspection records flow into the federal NBI database annually.
BridgeSafety reads the FHWA National Bridge Inventory (NBI) — the authoritative federal dataset covering every public road bridge longer than 20 feet in the United States. Each bridge record includes age, structural condition by component, traffic load, and the formal sufficiency rating that determines federal funding eligibility.
The Structurally Deficient designation flags bridges where at least one primary component (deck, superstructure, substructure) is rated in poor condition on the FHWA 0-9 scale. FHWA explicitly notes that bridges with this designation remain open and safe when they meet load-rating requirements; the designation signals rehabilitation need, not closure.
What the Condition Score Means
I 15 earns a Condition Score of 81/100, an A grade in the BridgeWatch composite. All three load-carrying components — deck, superstructure, and substructure — score in the upper end of the FHWA 0-9 condition scale, indicating physical condition consistent with routine maintenance rather than rehabilitation. An A does not guarantee zero issues; it indicates the latest NBI inspection found no individual component rated below "Satisfactory."
I 15 is not currently classified as structurally deficient. All three primary components — deck, superstructure, and substructure — rate above 4 on the FHWA NBI 0-9 scale, the threshold for the federal "structurally deficient" label. The bridge remains in the routine inspection cycle (typically every 24 months) without triggering federal rehabilitation funding eligibility.
Component Ratings
| Component | Rating | Scale |
|---|---|---|
| Deck | 7 | /9 |
| Superstructure | 8 | /9 |
| Substructure | 7 | /9 |
| Overall Score | 81/100 | Grade A |
FHWA scale: 9 Excellent, 7 Good, 5 Fair, 4 Poor, lower readings indicate progressively worse condition. Component ratings reflect the most recent inspection submitted to the National Bridge Inventory.
Age and Traffic Context
I 15 was built in 2001, 25 years ago. Bridges of this vintage are in mid-life and typically begin to require deck overlays, joint replacement, and steel painting on a recurring cycle. Age alone is not a condition indicator — many bridges of this era are well-maintained and rate Good across components.
I 15 carries roughly 296K vehicles per day, a heavy traffic volume that places it among the higher-priority structures in the inventory for maintenance allocation. Heavy daily traffic accelerates deck wear, joint deterioration, and accumulated fatigue on superstructure elements, which is why busy interstate and arterial bridges often appear on rehabilitation priority lists.
Bridge Details
Frequently Asked Questions
Is I 15 safe to cross?
I 15 remains open to traffic at posted load limits set by the owning state DOT. Its current Condition Score is 81/100 (Grade A). NBI condition ratings describe observed physical condition; they are not closure or safety determinations. State DOTs and the FHWA bridge program are the authoritative sources for any operational restriction on a specific structure. The bridge does not meet the federal definition of "structurally deficient."
What do the deck, superstructure, and substructure ratings mean?
On the FHWA NBI 0-9 scale: 9 is Excellent, 7 Good, 5 Fair, 4 Poor, and 0 means the component has failed. I 15 rates deck 7/9, superstructure 8/9, and substructure 7/9. The deck is the riding surface; the superstructure carries loads from deck to bearings (girders, beams, trusses); the substructure transfers loads to foundations (piers, abutments). A rating of 4 or lower on any of the three triggers the "structurally deficient" classification.
When was I 15 last inspected?
Federal regulation requires inspection at least every 24 months by a certified team leader. Inspection records flow from the Nevada Department of Transportation to the FHWA NBI; the dataset on this page reflects the 2025 federal NBI release, refreshed April 2026. For the most recent inspection report or any operational status (postings, lane closures), the Nevada DOT is the authoritative source.
Is I 15 structurally deficient?
No — I 15 does not currently meet the FHWA "structurally deficient" definition. All three primary components rate above 4 on the NBI 0-9 scale.
Where can I see official inspection records for I 15?
The Federal Highway Administration publishes the underlying inspection data through the National Bridge Inventory (https://www.fhwa.dot.gov/bridge/nbi.cfm). The Nevada DOT publishes additional state-level reporting and operational notices. The ASCE Infrastructure Report Card provides national-level analysis that draws on the same NBI data.