HomeMy WebLinkAboutB23-1021 Honey Run Creek Bridge Report (2)Horning Ranch Bridge
over Honey Run Creek
H20 Load Rating Evaluation Report
Prepared By: Matt Crete, P.E. (License No. C78412)
June 9, 2023
Matt Crete, P.E.
To: Whom It May Concern
RE: Evaluation of H20 Load Rating Suitability of Private Bridge at Horning Ranch
1. SCOPE OF REPORT
Matt Crete, a Civil Engineer licensed in the State of California, commissioned to perform a H20
Load Rating evaluation of a bridge at Horning Ranch in Butte Creek Canyon, Butte County, CA.
An initial inspection was performed to determine the structure's load carrying capacity and, in
turn, confirm or refute that H20 certification is warranted. Structure elements were inspected
and measured at arm’s reach.
2. DESCRIPTION OF STRUCTURE
Year Built Unknown
Location Latitude: 39.750107 N, Longitude: -121.671055 W
Location Description In Butte County, CA on private, unnamed gravel road,
approximately 1800 ft. from Honey Run Road
Facility Carried Private Gravel Road
Bridge Number Not Available
Structure Description Single-span bridge consisting of steel rolled-section beams
and dimensional lumber deck
Span Length 16’-6” measured between faces of abutments
Width 14’-0” nominal width, approx. 12’ accessible to traffic
Skew 0 degrees
Date(s) of Inspection Initial inspection completed 5/30/2023, supplemental
inspection completed 6/7/2023
Inspection Type(s) Each inspection was routine (arm’s reach) inspection
Load Capacity
Inspections of the structure performed as commissioned and
evaluated for sufficiency of H20 Load Rating. Based on an
engineering analysis of the structural elements’ section
moduli, certification of H20 Load Rating is acceptable
June 9, 2023
Matt Crete, P.E.
3. FIELD INSPECTION ASSESSMENT
The initial inspections were performed on the afternoon of May 30, 2023. Ambient conditions
were clear skies with a temperature of approximately 80 °F. The structures were observed to
be in overall fair condition, consistent with estimated age, and level of maintenance since
construction. Supplemental inspections were performed on the afternoon of June 7, 2023.
Ambient conditions were partly cloudy skies with an ambient temperature of approximately 75
°F.
DECK
Decking consists of transverse 4x12 dimensional lumber overlain with longitudinal 2x12
dimensional lumber travel path surfacing
SUPERSTRUCTURE
Superstructure consists of 4ea. rolled-section steel beams. Based on dimensions measured,
beams were estimated to be W12x36.
BARRIER
No barrier present on structure at time of inspection
ABUTMENTS
Abutments consist of concrete (reinforcement not known, measured, or verified) seats with short
wingwall projections. No detailed abutment inspections were performed.
CHANNEL
Structure spans Honey Run Creek, which is a seasonal creek, but often sees flows throughout
the year. The creek flow was approximately 16 ft. wide at the time of inspection.
UTILITIES ON OR NEAR STRUCTURE
No utilities were observed on or in the immediate vicinity of structure.
June 9, 2023
Matt Crete, P.E.
4. STRUCTURE CAPACITY CALCULATIONS & LOAD RATING RECOMMENDATION
Length of Span = 16.5 ft.
Weight of Decking = 130 plf
H20 Loading: Front Axle Load = 8k (4k per tire), Rear Axle Load = 32k (16k per tire pair)
Axle Spacing = 14’-0”
Demand: MMAX = 42.209 k-ft fb = 15.165 ksi < 0.6fy (0.6*36 = 21.6 ksi)
VMAX = 8.923 k fv = 3.172 ksi << 0.4fy (0.4*36 = 14.4 ksi)
△MAX = 0.280” 0.280” << L/200 (198”/200 = 0.99”)
Based on the calculations above, H20 Load Rating is warranted. Loads traversing the Structure
shall be limited to speeds no to exceed 5 mph.
It is recommended that regular biennial inspections of the structure be performed to evaluate
the structure’s condition and capacity.
If discrepancies are noted, please contact the undersigned immediately.
Regards,
Matt Crete, P.E.
License No. C78412